The age of Somu is one-third his father's. 10 years back he was one-fifth of his father's age. What is his persent age ? Answers.
A) 11
B) 13
C) 14
D) 12
E) 20

Rationale: "explanation : let somu ' s age be x and that of his father be 3 x . so , x - 10 = 3 x - 10 / 5 = x = 20 answer : option e"
Answer: E