A is two years older than B who is twice as old as C. If the total of the ages of A, B and C be 72, then how old is B? Pick
A) 28 years B) 19 years C) 29 years D) 10 years E) 12 years

Rationale: "let c ' s age be x years . then , b ' s age = 2 x years . a ' s age = ( 2 x + 2 ) years . ( 2 x + 2 ) + 2 x + x = 72 5 x = 70 = > x = 14 hence , b ' s age = 2 x = 28 years . answer : a"
Answer: A