Question

a boy spends 3/4 of his pocket money and then 4/5 of the remainder is given to his sister. If he has 40 left what did he have at first?​

Answer 1

Answer:

800

Step-by-step explanation:

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

Answer 2

Answer:800

Step-by-step explanation: (3x/4) = initial spending in terms of the original amount

4/5 the remainder is given by

( X - (3x/4 ) 4/5

=4/5 * x/4

=4x/20

3x/4 + 4x/20 = X - 40

19x = 20x -800

-x = -800

Therefore,

X = 800.

where X reps the initial amount.

hope you understand];]