Masood’s age 18 years hence will be thrice his age four years ago. Find Masood’s present age?

A. 12 years
B. 21 years
C. 18 years
D. 9 years
E. None of these
Explanation:
Let Mudit’s present age be ‘m’ years.
m + 18 = 3(m – 4)
=> 2m = 30 => m = 15 years.