Question

Present age of father is 42 years and that of his son is 14 years. find the ratio of age of father to the age of son when father was 30 years old.

Answer 1

at present
father age =42 years
son age= 14 years

12 years ago
father age =42-12=30 years
son age =14-12= 2 years
ratio = father age: son age
=30:2
=15:1

Answer 2

Here is your solution

present father age 42
present son age is 14

After 12 years

Fathers age =42-12=30 years
son age= 14-12=2 years

Ratio of father age and son age
=30:2
=15:1

hope it helps you