A father is twice his son's present age. How many years ago, was he three times his son's age, if his son's age is now 20 years?

Options

A. 8 years
B. 10 years
C. 12 years
D. 15 years

Answer

B

Explanation

Present age of son = 20 years His father.s present age = 40 years
10 years ago
The age of son = 20-10=10 years Father.s age = 40 - 10 = 30 years `30=10xx3`