Ten years ago, the sum of ages of a father and his son was 34 years. If the ratio of present ages of the father and son is 7:2, find the present age of the son.

12 years

According to the question:

Ten years ago, the sum of ages of a father and his son was 34 years. We can also say that: Sum of present age of father and son is:

S + F = 54

Ratio: 7: 2

So, the present age of son: \(\frac{2 }{9 }\) x 54 = 12 years