A man is 30 years older than his son. In two years, his age will be twice the age of his son. The present age of the son is?  Options
A) 16 B) 19 C) 15 D) 20 E) 28

Rationale: "let the son ' s present age be x years . then , man ' s present age = ( x + 30 ) years . ( x + 30 ) + 2 = 2 ( x + 2 ) x + 32 = 2 x + 4 = > x = 28 . answer : e"
Answer: E