The age of Mohan is four times that of his son Ajit. If the sum of their ages is 30 years, Ajit’s age is years

The age of Mohan is four times that of his son Ajit. If the sum of their ages is 30 years, Ajit’s age is years.

1. 6
2. 7
3. 9
4. 10

Sol:

Let Ajit’s present age be x.

Mohan’s present age is 4 times that of his son Ajit = 4x

Sum of their ages is 30 years.

⇒ x + 4x = 30

⇒ 5x = 30

=>x=30/5

=>x=6 years