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 42, then how old is B? Choose the correct choice from the following choices:
A) 16  B) 8  C) 9  D) 10  E) 11

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 = 42 5 x = 40 = > x = 8 hence , b ' s age = 2 x = 16 years . answer : a"
Answer: A