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 22, then how old is B? Choices: A) 17 years B) 19 years C) 29 years D) 8 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 = 22 5 x = 20 = > x = 4 hence , b ' s age = 2 x = 8 years . answer : d"
Answer: D