The ratio of ages of A and B, four years ago, was 7 : 5. The ratio of their ages, 6 years from now, will be 19 : 15. What is the ratio of the present ages of A and B?

4 : 3

Lets assume four years ago age of A be 7x and age of B be 5x

Given, \(\frac{7x + 4 + 6}{5x + 4 + 6}\) = \(\frac{19}{15}\)

          ⇒ 10x = 40

          ⇒ x = 4

Present age of A = 32 years

Present age of B = 24 years

Ratio of present ages of A and B = \(\frac{32}{24}\) = 4:3