Son's age is one-third of father's age. In 12 years from now son's age will be one- half of the father's age. What is the age of the son at present?
A
6
B
10
C
24
D
12
Correct Answer: 12
Son = x Father = 3x 2 ( x + 12) = 3x + 12 2x + 24 = 3x + 12 x = 12