Six years ago, the ratio of the ages of Ram and Sai was 6 : 5. Four years hence, the ratio of their ages will be 11 : 10. What is Sai’s age at present ?

\par Let the ages of Ram and Sai 6 years ago be 6x and 5x years respectively.

\frac{(6x + 6) + 4}{(5x + 6) + 4} = \frac{11}{10}

10(6x+10) = 11(5x+10)

5x = 10
x = 2

\par Sai's present age = (5x+6) = 16 years.