The ages of two person differ by 20 years. If 7 years ago, the elder one be 5 times as old as the younger one, their present ages(in years) are respectively
Select the correct option
A) 30 , 10  B) 32 , 12  C) 29 , 9  D) 50 , 30  E) 20,10

Rationale: "let their ages be x and ( x + 20 ) years . then , 5 ( x - 7 ) = ( x + 20 - 7 ) = > 4 x = 48 = > x = 12 their present ages are 32 years and 12 year . answer : b"
Answer: B