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, the how old is B?
Choose the correct choice from the following answers:
A) 7
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 = 22 ⇒ 5 x = 20 ⇒ x = 4 . hence , b ' s age = 2 x = 8 years . answer : c"
Answer: C