Question

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

Answer 1

Sagar's present age is 16 years.

Let Sagar's age be S six years back. Kunal will be 6*S/ 5
Add 10 year to both the ages (6 years until present day and 4 more)
Sagar will be (S+10) and Kunal ((6*S/5)+10)

using the ratio Kunal : Sagar as 11:10
((6S/ 5) + 10) / (S+10) = 11/10

Solving this we get S = 10

This was 6 years back hence present age of Sagar will be 10+6 = 16