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 42, the how old is B?	Choose the most appropriate option.
A) 16  B) 9  C) 8  D) 11  E) 10

Rationale: "explanation : 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