A father's age is 3 times that of his son. Five years later, he will be two and a half times as old as his son. How old is his son now?
A
15 years
B
10 years
C
12 1/2 years
D
None of these
Correct Option:
A
Explanation
Let the son's present age be x. The father's age is 3x. After five years, 3x + 5 = 2.5(x + 5). Solving gives 3x + 5 = 2.5x + 12.5, hence 0.5x = 7.5 and x = 15.
