100 coins are lying flat on a table. 10 of them are heads up and 90 are tails up.You can’t see which one is which. How can we split the coins into two piles such that there are same number of heads up in each pile?

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The negative hero in each story

I grow up super tall. When I die, I give a mighty fall. What am I?

What has roots that nobody sees, and is taller than trees. Up, up it goes, and yet it never grows.

What did the hamburger buy his sweetheart?

I provide cover for games of footsie and tax-free wages. What am I?

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100 coins are lying flat on a table. 10 of them are heads up and 90 are tails up.You can’t see which one is which. How can we split the coins into two piles such that there are same number of heads up in each pile?

Answer: Make 2 piles with 10 coins and 90 coins each. Now, flip all the coins in the smaller pile.

Solution:

Let’s consider a case
Pile 1: 88T, 2H
Pile 2: 2T, 8H

Flipping the coins in Pile 2

Pile 1: 88T, 2H
Pile 2: 2H, 8T

Pile 1(heads) = Pile 2(heads)

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