4  years ago, the average age of P and Q was 28 . The average age of P, Q and R today is 28 . Age of R after 5 years will be:

25 years 

4 years ago, the average age of P and Q = 28

Sum of the ages of P and Q four years ago = 56

Sum of the present age of P and Q = 2 × 28 + 8 = 64 years

The average age of P, Q and R today= 28 years

Sum of the present age of P, Q and R = 28 × 3 = 84 years

∴ R’s present age = 84 – 64 = 20 years

∴ R’s age after 5 years = 20 + 5 = 25 years