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	Pick
A) 16
B) 14
C) 15
D) 18
E) 20

Rationale: "explanation : let the son ' s present age be x years . then , man ' s present age = ( x + 20 ) years = > ( x + 20 ) + 2 = 2 ( x + 2 ) = > x + 22 = 2 x + 4 so , x = 18 . answer : d"
Answer: D