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  • INTERVIEW QUESTIONS GENERAL LOGICAL & APTITUDE DETAILS
    Question :
    A banana plantation is located next to a desert. The plantation owner has 3000 bananas that he wants to transport to the market by camel, across a 1000 kilometer stretch of desert. The owner has only one camel, which carries a maximum of 1000 bananas at any moment in time, and eats one banana every kilometre it travels. What is the largest number of bananas that can be delivered at the market?
    Category Logical & Aptitude Interview Questions
    Rating (0.3) By 1498 users
    Added on 7/7/2005
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    Rate it!
    Answers:

    The Solution: 533 1/3 bananas.
    Explanation: Since there are 3000 bananas and the camel can carry at most 1000 bananas, at least five trips are needed to carry away all bananas from the plantation P (three trips away from the plantation and two return trips):
    P (plantation)
    ===forth===>
    <===back====
    ===forth===>
    <===back====
    ===forth===>

    A
    Point A in the abouve picture cannot be the market. This is because the camel can never travel more than 500 kilometres into the desert if it should return to the plantation (the camel eats a banana every kilometre it travels!). So point A lies somewhere in the desert between the plantation and the market. From point A to the next point, less than five trips must be used to transport the bananas to that next point. We arrive at the following global solution to the problem (P denotes the plantation, M denotes the market):
    P (plantation)
    ===forth===>
    <===back====
    ===forth===>
    <===back====
    ===forth===>

    A
    ===forth===>
    <===back====
    ===forth===>
    B
    ===forth===>
    M (market)
    Note that section PA must be in the solution (as explained above), but section AB or section BM might have a length of 0. Let us now look at the costs of each part of the route. One kilometre on section PA costs 5 bananas. One kilometre on section AB costs 3 bananas. One kilometre on section BM costs 1 banana. To save bananas, we should make sure that the length of PA is less than the length of AB and that the length of AB is less than the length of BM. Since PA is greater than 0, we conclude that AB is greater than 0 and that BM is greater than 0.
    The camel can carry away at most 2000 bananas from point A. This means the distance between P and A must be chosen such that exactly 2000 bananas arrive in point A. When PA would be chosen smaller, more than 2000 bananas would arrive in A, but the surplus can't be transported further. When PA would be chosen larger, we are losing more bananas to the camel than necessary. Now we can calculate the length of PA: 3000-5*PA=2000, so PA=200 kilometres. Note that this distance is less than 500 kilometres, so the camel can travel back from A to P.
    The situation in point B is similar to that in point A. The camel can't transport more than 1000 bananas from point B to the market M. Therefore, the distance between A and B must be chosen such that exactly 1000 bananas arrive in point B. Now we can calculate the length of AB: 2000-3*AB=1000, so AB=333 1/3. Note that this distance is less than 500 kilometres, so the camel can travel back from B to A. It follows that BM=1000-200-333 1/3=466 2/3 kilometres. As a result, the camel arrives at the market with 1000-466 2/3=533 1/3 bananas.
    The full scenario looks as follows: first, the camel takes 1000 bananas to point A. There it drops 600 bananas and returns with 200 bananas. Then the camel takes again 1000 bananas to point A. Again, it drops 600 bananas and returns with 200 bananas. After this, the camel takes the last 1000 bananas from the plantation to point A. From point A, it leaves with 1000 bananas to point B. In point B, it drops 333 1/3 bananas and returns with 333 1/3 bananas. Then it takes the second load of 1000 bananas from point A to point B. Finally, it carries the 1000 bananas from point B to the market, where it arrives with 533 1/3 bananas.



    Answer is 533 and 1/3 banana

    If Camel just picks up a load of 1,000 bananas and heads out across the desert, she will eat them all up by the time she gets to the other side. She will also leave 2,000 bananas, unused, to rot back at the oasis. The trick is to use those 2,000 bananas as fuel to get the remaining 1,000 bananas as far across the desert as possible, before Camel makes her final dash for the market.

    Camel needs to eat five bananas per mile so long as she is trying to ferry more than 2,000 bananas. Later, when she's hauling between 1,000 and 2,000 bananas, she needs three bananas per mile. And after that, she only eats one banana per mile.

    To understand why, let's start at the beginning.

    Camel is standing there in the oasis with 3,000 bananas. She picks up the first 1,000. Say she carries them just one mile into the sand, eating one banana. She could drop 999 bananas there, but then she couldn't walk back. So, being a camel with foresight, she drops 998 bananas and keeps one to eat on the return trip.

    Now she can pick up the second 1,000 bananas and do the same thing, dropping 998 at the one-mile marker and shambling back to the oasis.

    With the third load, there's no return trip: all her bananas have been moved one mile.

    How many did she eat up? Five: two on the first round trip, two on the second, and one on the last trip, which is one-way.

    She could keep this up, one mile at a time, for 200 miles, by which time she would have used up 1,000 bananas. Or she could just take the first load 200 miles, drop 600 bananas, go back, pick up the next 1,000, etc. Either way, she will find her self at the 200-mile marker with 2,000 bananas.

    (Note that there are no monkeys or hungry humans out there in the sand dunes, and no other camels, either. Camel feels her bananas will be safe when she drops a load in the desert and goes back for more.)

    Once she has the 2,000 bananas out in the desert, Camel the Mathematical Camel reasons that she now needs three bananas per mile to push her stash farther: 1 round trip for the first load of bananas and 1 one-way trip for the second load. Either with her calculator or with mental math, she determines that she will use up the second 1,000 bananas moving the supply forward 333 1/3 miles. She can either proceed in one-mile increments, or go the whole 333 1/3 miles at once, or anything in between. In the end, Camel finds herself with 1,000 bananas 533 1/3 miles (200 + 333 1/3) into her journey.

    It's hot, but Camel takes a deep breath, picks up the 1,000 bananas, and slogs on. This time she can just keep going with no return trips, because she hasn't left any bananas in the desert - just in her stomach.



    433 2/3 miles farther on, and lighter by 433 2/3 bananas (she's a nibbler), Camel pads out of the desert and into the market, where a mob of camel-lovers and mathematicians is waiting to pay her handsomely for the 533 1/3 bananas (1,000 - 433 2/3) she has left. She even sells that last 1/3 of a banana to a souvenir hunter from the Annenberg Channel.

    In short

    533 1/3 bananas well 533 anyway

    First leg-out, back, out, back, out. 5 one way trips bananas consumed 1000, bananas moved 2000 1000/5=200 units.
    Status 2000 bananas at unit 200

    Second leg out, back, out. 3 one way trips
    Bananas consumed 1000, bananas moved 1000
    1000/3=333 1/3 units
    Status 1000 bananas at unit 200+333 1/3=533 1/3

    Third les one trip 466 2/3 units (1000-533 1/3)
    Bananas consumed 466 2/3
    Bananas delivered on far side 533 1/3.



    Posted by: poornimaa    

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    The number of Bananas that were transported was "0".
    The camel starts with 1000 bananas and it eats 1 banana for each km. So by the moment it reaches the market the number of bananas wil be "0".



    Posted by: Ranganath    

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    the camel can never end up carrying any bananas as it wud eat one banana for one km, and the dist being 1000 km, there wont be any banana left, even though there are 3000 bananas , since it cannot carry more than 1000 at a time , theres no possibility of any bananas reaching the destination



    Posted by: abishahb    

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    Camel cannot reach with even a banana



    Posted by: vijay    

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    Zero



    Posted by: kishore    

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    There will be zero bananas



    Posted by: shobana    

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    answer will be zero.



    Posted by: sagar singh    

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    no banana was left because for every 1 km 1 banana was eaten by the camel and the trip is 1000km



    Posted by: sowmya    

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    The result is said to be zero.



    Posted by: rajag    

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    there will be no bananas delivered



    Posted by: s.nishanthi    

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    no bannana coz 1000 bannana nd 1000 km camel will eat a bannana evry kmso all will get finished



    Posted by: malvika jain    

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    There will be 0 banana.bcause camel can carry only 1000 banana at a time and there are 3000 banana so to reach the market camel has to travel 3 times and camel eats one banana per kilometer thus no banana will left.



    Posted by: swapnil nishith    

    Contact swapnil nishith Contact swapnil nishith

    There will be no bananas left to be transported to the market....coz the camel eats 1 banana for every 1km, thus all 1000 bananas are over, by the time the the market is reached...



    Posted by: Radhika B.    

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    there is no banana plantation in desert.



    Posted by: viruz    

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    zero banana wil be transport



    Posted by: kattty    

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    3 bananas



    Posted by: bharath    

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    0 banana will be transported bcoz camel can carry 1000 bananas maximum and he eats one banana at one km
    so there are two cases
    1) suppose camel carries less than 1ooo bananas to mkt he ate one banana at each one km so wat will be reached to mkt.............. nothing since he has to cover 1000 km distance even his own need did not fulfill bcoz he needed minimum 1000 bananans for himself only but he had less than 1000 bananas
    2) now if he carries 1000 bananas to mkt now wat will happened his own need will be fulfilled bat he has nothing left to carry to mkt
    3) he cannot carry more than 1000 bananas
    if it is possible then some bananas wounld reach to mkt



    Posted by: jasmine    

    Contact jasmine Contact jasmine

    3 banana will be transported because in first trip camel carry maximum 1000 banana and he eat 1 banana per 1km when he reach 999km after that he has eaten 999 banana and rest 1 banana dilever to distance so that in three trip he eat =999*3
    rest banana=1000*3-2997=3



    Posted by: Sonu Raghav    

    Contact Sonu Raghav Contact Sonu Raghav

    as the camel could carry only 1000 banannas and eat 1 bananna in every 1 km of 1000 km .the bananna that will reach in the market are all eaten by the camel.1000 bananna will be reaching along with the camel.but their will be no more bananna to be sold in the market.3000 banannas will be raching in the market



    Posted by: david z. joute    

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    max 600 bananas can reach to market.



    Posted by: Bipin Maurya    

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    not even 1 banana can be transported



    Posted by: sayee    

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    there r 1000 bananas in the journey of 1000 km so if a camel eats 1 banana after every 1km so there will no banana left so the answer is 0



    Posted by: mohit choudhary    

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    Consider, the camel travels 250kms from plantation with 1000 bananas on its each trip. So,
    1.500 bananas will be kept at 250km and 500 will be eaten(to and fro) in its first trip.
    2.second trip is same as above.
    3.As 1000 left, it will eat 250 and 750 bananas will be brought at 250km.
    Total = 1750 bananas

    Reaching next 250km(i.e 500th km) it takes
    1.1000 bananas on 1st trip, 500 banana will be placed on 500th km.
    2.2nd trip, eating 250 bananas, 500 will be brought.
    Total = 1000 bananas

    Then, with 1000 bananas, he can travel to the market with 500 bananas where 500 are eaten by the camel by its way.

    The owner brings 500 bananas to the market



    Posted by: Annamalai    

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    Zero.



    Posted by: G.Bhagyaraju    

    Contact G.Bhagyaraju Contact G.Bhagyaraju

    750 bananas !!!

    First of all travel 500 km (3 times)
    first take 1000 bananas and put in half way and return again take 1000 banana drop in half way return and again take 1000 banana and drop it half way, i.e., at 500 km distance.
    so now you have 1500 banana left at half distance.

    Now take 1000 bananas and travel 250 km, drop it there and return and take 500 remaining bananas and travel 250 km and drop it. so now you have 1000 bananas left and a distance of 250 km is remaining. so take 1000 bananas and go. So at last you left with 750 bananas.



    Posted by: asheesh singh    

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    if he's location far 1000 Km next to the desert and he has 1 camel, so let him find another job or another way to transport his bananas



    Posted by: George    

    Contact George Contact George

    the max no of banana will be 500
    first the camel will take 1000 bananas to 250km upto three times so the total no of banana he eat in three times going and one time returning will be 1250...
    now it will move another 250 km by taking 1000 bananas and will eat 250 in going and 250 in returning and drop another 500 after 500 km and will take the remaining 750 to that 500 km and will eat 250 out of them
    now the total bananas left after 500 km will be 1000 and camel will take it to another 500 km and will eat 500 thust the total no of banana left will be 500



    Posted by: srish    

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    200 banana....



    Posted by: Hardik Shah    

    Contact Hardik Shah Contact Hardik Shah

    ans:camal can reschs 533 bananas to the desert.



    Posted by: mohit soni    

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    800 bananas.



    Posted by: SUSHANT PARASHAR    

    Contact SUSHANT PARASHAR Contact SUSHANT PARASHAR

    800 bananas.
    Travel the distance in 4 steps.
    1. Travel 150km 300 times with 1000 bananas each time.finally we have 2550 bananas.
    2. Travel next 250km 3 times.first 2 times trael with 1000 bananas each time and third time travel with remaining 550 bananas.here finally we have 1800 bananas.
    3. Travel next 400 km 2 times.1st time with 1000 bananas and 2nd time with remaining 800 bananas. hereat the distance of total 800km (150+250+400=800)from the banana plantation we are left with 1000 bananas.
    4. Now travel the remaining 200km with 1000 bananas and at the destination we have 800 bananas.



    Posted by: SUSHANT PARASHAR    

    Contact SUSHANT PARASHAR Contact SUSHANT PARASHAR

    0 Bananas.

    The camel cannot deliver any banana's due to the below reasons

    1. Camel starts of with 1000 banana.
    2. consumes 1 banana per km. (thus finishes all the banana)
    3. Cannot come back thus stays back ..

    Thanks
    Sarada



    Posted by: Sarada    

    Contact Sarada Contact Sarada

    400 Bananas.
    0==>200==>400==>800==>1000
    1. The remaining bananas after transporting 200 km its 2000
    2. And at 400km transport it will be 1400
    3. And at 600km it will be 800
    4. So only 800 bananas left to transport to 400kms. so 800-400=400 bananas.



    Posted by: Malatesh    

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    Totally one thousand kilometer every kilometer eat one banana so no more banana delivered to market



    Posted by: Sekar    

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    the answer is zero as camel eats 1 banana per 1km so no banana can be reached to the destination



    Posted by: mamillagirish    

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    ANS:500 bananas maximum

    initially the camel starts with 1000 bananas and it will travel for 250km and deposits 500 bananas there let us say that point as A .now it with the remaining 250 bananas it will travel back to the starting point and again starts with 1000 bananas and deposits another 500 bananas at point A .Now again it will go back and starts with last 1000 bananas and will travel for 500km and deposits 250 bananas there and with the remaining 250 bananas it will return to point A where there is a stock of 1000 bananas .Now starting from A it will travel to point B where the camel is left with 750 bananas and there is a stock of 250 bananas which are previously deposited so it will again start at point B with a load of 1000 bananas and reach the destination which is 500km away with 500bananas



    Posted by: rohit varma    

    Contact rohit varma Contact rohit varma

    First move: 998+998+999(For fst KM=1000+1000+995)
    So on ..., after 1000/5 KM total bananas are 1000+1000 from here next KM=999+998=1000+997
    So on, ... after 200+1000/3 KM total bananas left are 1000+1

    Here after next KM i.e 534th KM total bananas left are 1000

    So, left KM are 1000-534=466

    From remaining 1000 bananas 466 are eaten by Cammel remaining bananas are===534

    So ANSWER IS 534 Bananas



    Posted by: Shanthkumar Bugudi    

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    Total 800 banana !!!

    here i'm optimising my earlier solution in which it was 750.

    its in 4 steps

    400km-->300km-->100km-->200km

    1. so in 3 trip(400 km) you left with 1800 banana after 400 km.
    2. now take 1000 banana and drop it after 300 km. return back take remaining 800 banana and drop it after 300km ..so now after 700 km(400+300) you left with 1200 banana.
    3. now take 1000 banana and travel 100 km, return back take remaining 200 banana and travel 100km. so now u left with 1000 banana after 800km.
    4. finaly take 1000 banana and travel remaining 200km so at last u left with 800 bananas....

    cheers !!!!



    Posted by: asheesh singh    

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    let the camel carry 1000 up to 400km and left 600 bananas and return back. let it continue the same process for two more times. so 1800 nos will be there at 400km. then let it carry 1000 till 800km and left 600 bananas and return back. then take all the remaining 800 bananas till 800km. so the total bananas at 800th km will be(600+400 = 1000). then finally the camel will reach 1000km with 8oo bananas. so the answer is 800 bananas



    Posted by: venkat    

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    6 banana



    Posted by: Naveen    

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    3 banana will be transported because in first trip camel carry maximum 1000 banana and he eat 1 banana per 1km when he reach 999km after that he has eaten 999 banana and rest 1 banana dilever to distance so that in three trip he eat =999*3
    rest banana=1000*3-2997=3



    Posted by: vijji    

    Contact vijji Contact vijji

    3 banana will be transported because in first trip camel carry maximum 1000 banana and he eat 1 banana per 1km when he reach 999km after that he has eaten 999 banana and rest 1 banana dilever to distance so that in three trip he eat =999*3
    rest banana=1000*3-2997=3



    Posted by: sweet anjju    

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    the ans is 1banana for 1 trip



    Posted by: pavan    

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    when camel carries 1000 banana for first trip he ate all the bananas after reaching to destination,so as no banana is left to eat, therefore the merchant and camel will be at the destination place and the remaning 2000 bananas is at source so no banana at destination becoz as camel required 1 banana at 1km therfore it cant able to came back again as no banana with them.



    Posted by: sameer    

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    Ans: 500 bananas

    A====B====C====D====Market
    250 250 250 250 total 1000kms

    1.Camel takes 1000 bananas and reach B.So 750 remaining.He will keep 500 bananas there.And go back to A using remaining 250.
    2.Camel again take 1000 and do same as in the Step 1.
    3.He again takes 1000 and goes to C.He keeps 250 bananas there and went back to B.
    4.He takes 1000 bananas from B and reaches C.Now only 750 remains.Camel take 250 from C.So total 1000.
    5.He goes to Market.Camel eats 500 bananas and remaining 500.
    So answer is 500.



    Posted by: Onyx    

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    Zero



    Posted by: Gouri    

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    only 3 banana reach the market



    Posted by: swamy    

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    That would be minus

    y bcoz

    1000+1000+1000=3000km from plantation to market
    1000+1000+1000=3000km from market to plantation

    so answer must be minus..there is no profit to that business man if posible he carry the bananas for profit...



    Posted by: vijaykumar.Penumutchu    

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    BANANA CAN'T BE GROWN IN HIGH TEMPERATURE.



    Posted by: SHEEMA SADIA    

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    BANANA CAN'T BE GROWN IN HIGH TEMPERATURE.



    Posted by: SHEEMA SADIA    

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    If the camel travel 500km then 500 banana will be saved camel returns nd again carry 1000 banana nd drop it at 500 km nd again 500 banana again same is done and now lft just 500km and 1000 banana are saved which he can sell



    Posted by: Jay shah    

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    The number of Bananas that were transported was "0".
    The camel starts with 1000 bananas and it eats 1 banana for each km. So by the moment it reaches the market the number of bananas wil be "0".



    Posted by: Aamir Sohel    

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    Answer is 500 Bananas.

    Explanation: Camel needs to carry all bananas in 3 different as destination as follow:

    First Destination: 250KM
    Second Destination: 500KM
    Third Destination: 1000KM

    Sum of 3 destinations: 1000 KM

    Here Is The Logic
    -----------------
    Total Bananas: 3000
    First Destination (250km):

    Step1: Camel starts carrying 1000 banana. She eats 1 banana per Kilometer. Like this 250 bananas will be completed after 250KM. Now, 750 bananas are left. But, camel needs to eat 250 bananas more in order to return to the garden to bring another 1000 bananas. So, It leaves 500 bananas at first destination then start walking for garden along with 250 bananas to cover 250KM distance. (500 bananas saved)

    Step2: Repeat Step 1. Again 500 bananas will be left over by the camel at first destination of 250KM. (500 bananas saved)

    step3: Repeat Step 1. Here in this cycle camel need not to return to the garden. Like this 250 bananas more saved in this step. (750 bananas saved)

    Now summarize the bananas saved in different steps.

    500+500+750=1750

    1750 bananas are there at first destination of 250KM.

    CYCLE FOR FIRST DESTINATION ENDS HERE!
    -----------------------------
    Total Bananas: 1750
    Second Destination (500km):

    Step1: Camel starts carrying 1000 banana. She eats 1 banana per Kilometer. Like this 250 bananas will be completed after 250KM from first destination point. Now, 750 bananas are left. But, camel needs to eat 250 bananas more in order to return to the first destination to bring another 1000 bananas. So, It leaves 500 bananas at first destination then start walking for garden along with 250 bananas to cover 250KM distance. (500 bananas saved)

    step2: Repeat Step 1. Here in this cycle camel will carry only 750 bananas that are left. It eats 250 and need not to return to the first destination. Like this 250 bananas more saved in this step. (500 bananas saved)

    Now summarize the bananas saved in different steps of this phase.

    500+500=1000

    1000 bananas are there at second destination of 500KM.

    CYCLE FOR SECOND DESTINATION ENDS HERE!
    -----------------------------
    Total Bananas: 1000
    Third Destination (1000km):

    Step1: Camel starts carrying 1000 banana. She eats 1 banana per Kilometer. Like this 500 bananas will be completed after 500KM from second destination point. Now, 500 bananas are left. Camel need not to return any more. It leaves 500 bananas at third and final destination. (500 bananas saved)

    IN THIS WAY CAMEL WILL CARRY OUT 500 BANANAS TO ITS FINAL DESTINATION SAFELY.

    ABDUL RAHEEM




    Posted by: Abdul Raheem    

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    only 1000 bananas.



    Posted by: Priyanka Singh    

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    carry 1000 bananas to 667km distance and keep it there.
    in each trip at the end of 667km there will be 333 bananas.
    so after 3 trips of 1000 we will get 999 bananas at 667km distance.

    take those 999 bananas and travel remaining 333km.
    at the end you have 666bananas in the market.



    Posted by: Akshay    

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    Total 833 banana !!!

    here i'm optimising solution

    its in 3 steps

    333km-->500km-->167km=1000km

    1. so in 3 trip(333 km) you left with 2001 banana after 333 km.
    2. now take 1000 banana and drop it after 500 km. return back take remaining 1000 banana and drop it after 500km ..so now after 833 km(333+500) you left with 1000 banana.
    3. now take 1000 banana and travel 167 km so now u left with 833 bananas at the end.

    If the no of bananas are 4000 then it will be 1166

    its in 4 steps

    250-->333km-->500km-->167km=1000km

    1. so in 4 trip(250 km) you left with 3000 banana after 250 km.
    2. now in 3 trip(333 km) you left with 2000 banana after 583(250+333) km.
    3. now in 2 trips(417km) you left with 1166 banana at the end.


    All the best!!....



    Posted by: sathish     

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    1000---->667b
    333km --> 667b
    1000---->667b 333km 334-->167b
    333km --> 667b 167km
    1000---->667b 1000-->833b
    333km (1000-167)

    step1:from the source the camel carries 1000 bananas and reachs 333km. so, it has 667 at point b.repeat twice the step 1 . so, it has total 2001 bananas at point b.Consider one banana is left or camel has eaten it
    step2:again it take 1000bananas and travel 333km so it is left with 667 bananas.Repeat step2. so, at the end it has 1334
    step3:Now it takes 334 bananas and tarvels 167km.again form step 3 it take 1000banas and travels till the end (167 bananas on the way will be added with 1000)====1000-167+167-167=833



    Posted by: Dinesh kumar.J    

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    it's zero



    Posted by: Raghav chaturvedi    

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    On the market of Covent Garden, mrs. Smith and mrs. Jones sell apples. Mrs. Jones sells her apples for two per shilling. The apples of Mrs. Smith are a bit smaller; she sells hers for three per shilling. At a certain moment, when both ladies both have the same amount of apples left, Mrs. Smith is being called away. She asks her neighbour to take care of her goods. To make everything not too complicated, Mrs. Jones simply puts all apples to one big pile, and starts selling them for two shilling per five apples. When Mrs. Smith returns the next day, all apples have been sold. But when they start dividing the money, there appears to be a shortage of seven shilling. Supposing they divide the amount equally, how much does mrs. Jones lose with this deal?
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    Postman Pat delivers the mail in the small village Tenhouses. This village, as you already suspected, has only one street with exactly ten houses, numbered from 1 up to and including 10. In a certain week, Pat did not deliver any mail at two houses in the village; at the other houses he delivered mail three times each. Each working day he delivered mail at exactly four houses. The sums of the house numbers where he delivered mail were: on Monday: 18 on Tuesday: 12 on Wednesday: 23 on Thursday: 19 on Friday: 32 op Saturday: 25 on Sunday: he never works Which two houses didn't get any mail that week?
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    From a book, a number of pages are missing. The sum of the page numbers of these pages is 9808. Which pages are missing?
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    Below is an equation that isn't correct yet. By adding a number of plus signs and minus signs between the ciphers on the left side (without changes the order of the ciphers), the equation can be made correct. 123456789 = 100 How many different ways are there to make the equation correct?
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    William lives in a street with house-numbers 8 up to and including 100. Lisa wants to know at which number William lives. She asks him: "Is your number larger than 50?" William answers, but lies. Upon this Lisa asks: "Is your number a multiple of 4?" William answers, but lies again. Then Lisa asks: "Is your number a square?" William answers truthfully. Upon this Lisa says: "I know your number if you tell me whether the first digit is a 3." William answers, but now we don't know whether he lies or speaks the truth. Thereupon Lisa says at which number she thinks William lives, but (of course) she is wrong. What is Williams real house-number?
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    A swimmer jumps from a bridge over a canal and swims 1 kilometer stream up. After that first kilometer, he passes a floating cork. He continues swimming for half an hour and then turns around and swims back to the bridge. The swimmer and the cork arrive at the bridge at the same time. The swimmer has been swimming with constant speed. How fast does the water in the canal flow?
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    Consider a road with two cars, at a distance of 100 kilometers, driving towards each other. The left car drives at a speed of forty kilometers per hour and the right car at a speed of sixty kilometers per hour. A bird starts at the same location as the right car and flies at a speed of 80 kilometers per hour. When it reaches the left car it turns its direction, and when it reaches the right car it turns its direction again to the opposite, etcetera. What is the total distance that the bird has traveled at the moment that the two cars have reached each other?
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    On a nice summer day two tourists visit the Dutch city of Gouda. During their tour through the center they spot a cosy terrace. They decide to have a drink and, as an appetizer, a portion of hot "bitterballs" (bitterballs are a Dutch delicacy, similar to croquettes). The waiter tells them that the bitterballs can be served in portions of 6, 9, or 20. What is the largest number of bitterballs that cannot be ordered in these portions?
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    There is a unique number of which the square and the cube together use all ciphers from 0 up to 9 exactly once. Which number is this?
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    The gentlemen Dutch, English, Painter, and Writer are all teachers at the same secondary school. Each teacher teaches two different subjects. Furthermore: Three teachers teach Dutch language There is only one math teacher There are two teachers for chemistry Two teachers, Simon and mister English, teach history Peter doesn't teach Dutch language Steven is chemistry teacher Mister Dutch doesn't teach any course that is tought by Karl or mister Painter. What is the full name of each teacher and which two subjects does each one teach?
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    Barbara has boxes in three sizes: large, standard, and small. She puts 11 large boxes on a table. She leaves some of these boxes empty, and in all the other boxes she puts 8 standard boxes. She leaves some of these standard boxes empty, and in all the other standard boxes she puts 8 (empty) small boxes. Now, 102 of all the boxes on the table are empty. How many boxes has Barbara used in total?
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    A traveler, on his way to Eindhoven, reaches a road junction, where he can turn left or right. He knows that only one of the two roads leads to Eindhoven, but unfortunately, he does not know which one. Fortunately, he sees two twin-brothers standing at the road junction, and he decides to ask them for directions. The traveler knows that one of the two brothers always tells the truth and the other one always lies. Unfortunately, he does not know which one always tells the truth and which one always lies. How can the traveler find out the way to Eindhoven by asking just one question to one of the two brothers?
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    Richard is a strange liar. He lies on six days of the week, but on the seventh day he always tells the truth. He made the following statements on three successive days: Day 1: "I lie on Monday and Tuesday." Day 2: "Today, it's Thursday, Saturday, or Sunday." Day 3: "I lie on Wednesday and Friday." On which day does Richard tell the truth?
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    Assume that you have a number of long fuses, of which you only know that they burn for exactly one hour after you lighted them at one end. However, you don't know whether theyburn with constant speed, so the first half of the fuse can be burnt in only ten minutes while the rest takes the other fifty minutes to burn completely. Also assume that you have a lighter. How can you measure exactly three quarters of an hour with these fuses? Hint: 2fuses are sufficient to measure three quarter of an hour Hint: A fuse can be lighted from both ends at the same time(which reduces its burning time significantly)
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    Tom has three boxes with fruits in his barn: one box with apples, one box with pears, and one box with both apples and pears. The boxes have labels that describe the contents, but none of these labels is on the right box. How can Tom, by taking only one piece of fruit from one box, determine what each of the boxes contains?
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    A light bulb is hanging in a room. Outside of the room there are three switches, of which only one is connected to the lamp. In the starting situation, all switches are 'off' and the bulb is not lit. If it is allowed to check in the room only once to see if the bulb is lit or not (this is not visible from the outside), how can you determine with which of the three switches the light bulb can be switched on?
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    Jack and his wife went to a party where four other married couples were present. Every person shook hands with everyone he or she was not acquainted with. When the handshaking was over, Jack asked everyone, including his own wife, how many hands they shook. To his surprise, Jack got nine different answers. How many hands did Jack's wife shake?
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    Yesterday evening, Helen and her husband invited their neighbours (two couples) for a dinner at home. The six of them sat at a round table. Helen tells you the following: "Victor sat on the left of the woman who sat on the left of the man who sat on the left of Anna. Esther sat on the left of the man who sat on the left of the woman who sat on the left of the man who sat on the left of the woman who sat on the left of my husband. Jim sat on the left of the woman who sat on the left of Roger. I did not sit beside my husband." What is the name of Helen's husband?
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    You are standing next to a well, and you have two jugs. One jug has a content of 3 liters and the other one has a content of 5 liters. How can you get just 4 liters of water using only these two jugs?
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    In the middle of a round pool lies a beautiful water-lily. The water-lily doubles in size every day. After exactly 20 days the complete pool will be covered by the lily. After how many days will half of the pool be covered by the water-lily?
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