A boy spend 3/4 of is pocket money and then 4/5 of his remainder is given to his sister.If he has Rs. 40 left, What did he have at first.

Refer the following link:

https://www.meritnation.com/ask-answer/question/a-boy-spends-3-4-of-his-pocket-money-and-then-gives-4-5-of-t/fractions/6077725

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