How much money did he get from grandma?

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Grandma sent Johnny some money for his birthday. Johnny spent all of it in five stores. In each store, he spent $1.00 more than half of what he had when he came in.

How much money did he get from grandma?

posted Dec 15, 2014 by Anuradha Tabyal

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1 Answer

Ans. 62

Thinking in reverse order, in last shop he must have $2 left with him, then proceeding backwards:
let's assume he had $X when he went to 2nd last shop, then eqn. will be:
X - (X/2+1) = 2 ==> X = 6,
Similarily,
X - (X/2+1) = 6 ==> X = 14,
X - (X/2+1) = 14 ==> X = 30,
X - (X/2+1) = 6 ==> X = 62,

answer Dec 17, 2014 by Shashi Kant

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