Question

A boy spend3/4of his pocket moneyand than4/5of his remainder is given to his sister if he hav 40 rsleft. What did he have at first​

Answer 1

the answer is 800...

hope this helps you

Answer 2

let he have x rupee

now 3/4× x he spend

the money left is ( x-3x/4)

=x/4

he gave his sister 4/5 of x/4

(4/5× x/4 )= x/5

now he has left (x/4- x/5)

= x/20

which is equals to 40

therefore x/20=40

x= 800 rupee.