The age of Somu is one-third his father's. 7 years back he was one-fifth of his father's age. What is his persent age ?
Choose the correct option.
A) 11 B) 13 C) 14 D) 12 E) 10

Rationale: "explanation : let somu ' s age be x and that of his father be 3 x . so , x - 7 = 3 x - 7 / 5 = x = 14 answer : option c"
Answer: C