Question

CLASS 7TH
A BOY SPENDS 3/4 OF HIS POCKET MONEY AND THEN 4/5 OF THE REMAINDER IS GIVEN TO HIS SISTER.IF HE HAS RUPEES 40 LEFT,WHAT DID HE HAVE AT FIRST?

Answer 1

Answer:

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