5 years ago, the average age of P and Q was 15 years. Average

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5 years ago, the average age of P and Q was 15 years. Average age of P, Q and R today is 20 years. How old will R be after 10 years?

1. 35 years
2. 40 years
3. 30 years
4. 50 years

Correct Option: C

According to question ,
Present age of (P + Q) = 30 + 10 = 40 years
(P + Q + R)’s present age = 20 × 3 = 60 years
R’s present age = 60 – 40 = 20 years
∴ R’s age after 10 years = 20 + 10 = 30 years