Question

a boy spend 3 upon 4 of his pocket money and then 4.5 of the remainder is given to a sister if he has rupees 40 left what did he had at first

Answer 1

let pocket money be = x
X -3/4x is amount remaining with him after spending money.
X -3/4x= x/4 (on solving)
now he gave 4/5of remaining amount to his sister.
= x/4 - 4/5 of x/4
= x/4 - x/5
= x/20
amount remaining with him is =40
x/20=40
x=800
his pocket money is 800

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