The ages of two person differ by 20 years. If 4 years ago, the elder one be 5 times as old as the younger one, their present ages(in years) are respectively	Choose the correct choice from the following answers:  A) 30 , 10  B) 25 , 5  C) 29 , 9  D) 50 , 30  E) 20,10

Rationale: "let their ages be x and ( x + 20 ) years . then , 5 ( x - 4 ) = ( x + 20 - 4 ) = > 4 x = 36 = > x = 9 their present ages are 29 years and 9 year . answer : c"
Answer: C