A man is 20 years older than his son. In two years, his age will be twice the age of his son. The present age of his son is:  Choose the most appropriate option:
A) 14 years
B) 18 years
C) 20 years
D) 22 years
E) 16 years

Rationale: "let the son ' s present age be x years . then , man ' s present age = ( x + 24 ) years . ( x + 20 ) + 2 = 2 ( x + 2 ) x + 22 = 2 x + 4 x = 18 . answer : b"
Answer: B