Question

A man spends `2/5` of his salary on food and `3/10` on house rent, electricity, etc. What fraction of his salary is still left with him?

Answer 1

Let salary of man = Rs. 1

Amount spent on food = `2/5` of Rs. 1 = Rs. `2/5`

and amount spent house rent = `3/10` of Rs. 1

= Rs. `3/10`

Total amount spent = Rs. `2/5 + 3/10 = (4 + 3)/10 = 7/10`

∴ Amount left with him = `1 - 7/10 = (10 - 7)/10 = 3/10`