Puzzle 91 - solution

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 Here was the puzzle 91. 

 John inherited from his uncle 25% more money than his sister Helen. He wants to give her part of his money to have the same amount as her.

What percentage of his money should he give to Helen?

Let us say that John's sister inherited x rupees.
 
John inherited 25% more than her. Let us say his inheritance is y.

y = 0.25x + x = 1.25x
x = y/1.25

The extra amount received by John is 0.25x

Extra amount = 0.25x = 0.25 X  y/1.25  = y/5 = 0.2 y

To divide this equally among both, he has to give half of this amount to his sister. 

John should give 0.2 y/2 = 0.1 y = 10% of y to his sister.

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