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How can all soldiers go to the other side of the river using this boat ?

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There are 10 soldiers on the one side of the river. They need to go to the other side of the river. There is no bridge in the river and no one can swim in the river. One of the soldiers spots the boat with two boys inside. The boat is very small and the boys in the boats also very small. The boat can either hold two boys or one soldier.

Now tell me how can all soldiers go to the other side of the river using this boat ?

posted Jul 10, 2014 by Nikita Sehgal

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1 Answer

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Let the two side s of river be a and b (solders are on side a)
1. Send two boys and boat to b side
2. One boy will come with boat to side a
3. solder will go to side b with boat.
4. Remaining boy on side b will come to side a with the boat.

and the procedure will repeat until every solder get to side b

answer Aug 17, 2016 by Smriti

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In a word of riddles called Briddles, 9 numbers from 1 - 9 want to reach to the other side of the river. Since its a world of riddles, therefore, there are some rules:

Rule-1: Maximum 3 numbers can cross at a time.
Rule-2: River cannot sail on its own.
Rule-3: The sum of numbers crossing at a time must be a square number.

You need to plan trips such that minimum trips are needed for all numbers to cross.