10 Coins Puzzle

You are blindfolded and 10 coins are place in front of you on table. You are allowed to touch the coins, but can’t tell which way up they are by feel. You are told that there are 5 coins head up, and 5 coins tails up but not which ones are which. How do you make two piles of coins each with the same number of heads up? You can flip the coins any number of times.

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vipin Scholar Asked on 26th July 2015 in Math Puzzles.
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  • 1 Answer(s)

    For any given number, divide them into two group of equal number.
    Say we have 10 Coins, and we have to divide them into 5-5’s Group,

    First 5 would contain say x Heads, and ( 5- x ) tails.
    while other group would contain ( 5- x ) heads and x Tails.

    Just flip one Group totally, and it would be same as the other Group. in other words,
    x heads and ( 5- x ) tails would convert into ( 5- x ) heads and x tails. which is similar to other group.

    SherlockHolmes Expert Answered on 5th August 2015.
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