### Five years ago, the average age of P and Q was 25. The average age of P, Q and R today is 25. Age of R after 5 years will be :

A. 15 years

B. 20 years

C. 40 years

D. 35 years

$\begin{array}{l}\text{According to the question,}\\ \frac{P+Q}{2}=25\\ P+Q=50\ldots..(\text{ i) }(5\text{ years ago })\\ \frac{P+Q+R}{3}=25\\ P+Q+R=75\ldots..\text{ (ii) (present age) }\end{array}$ ∴ Present age of P + Q = 50 + 10 = 60 years Present age of R = 75 – 60 = 15 years $\begin{array}{l}\text{∴ Age of R after 5 years}\\ \text{= 15 + 5 = 20 years}\end{array}$