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13 June, 22:50

5 stacks of coins that looks identical. each stack has 5 coins each. 4 of those stacks weigh the same, 1 stack has coins that weigh exactly 1 pound less. using a digital scale once, find out the position of the stack that is less weight.

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  1. 13 June, 22:55
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    Step-by-step explanation:

    The digital scale has to be used once.

    Let the coins that have normal weights are normal coins and the coins that has a weight 1 pound less are called defected coins.

    5 stacks are there in which any four contains normal coins and 1 stack contains defected coins.

    Took 1 coin from 1st stack, 2 coins from 2nd stack and so on ...

    Weigh the coins and see the result.

    If the total weight is 1 pound less than the stack 1 contains defected coin.

    If the total weight is 2 pounds less than the stack 2 contains defected coin.

    If the total weight is 3 pounds less than the stack 3 contains defected coin.

    If the total weight is 4 pounds less than the stack 4 contains defected coin.

    If the total weight is 5 pounds less than the stack 5 contains defected coin.
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