Question

a man spends 2/5 of his income and has 120 left. how much did he have initially

Answer 1

Let the total income of the man be x
Expenditure =2x/5
Saving=120
2x/5+120=x
(2x+600)/5=x
2x+600=5x
600=3x
x=200

He initially have Rs. 200

Answer 2

let total income be x then man has spent 2/5 of total income hence 2/5 of x =2/5x. given money Left= 120 RS. now , x-2/5x=120. then we get 3/5x = 120. thus , x=120x5/3. =200rs. hence the total money he have is 200rs