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 ?
Choose the correct choice.
A) 11	B) 13	C) 14	D) 12	E) 20
Explanation :   Let Somu's age be x and that of his father be 3x.   So, x - 10 = 3x - 10/5 = x = 20   Answer : Option 20
<result>E</result>
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 ?