A is two years older than B who is twice as old as C.If the total of the ages of A,B nd C be 27,then how old is B ?	Choose the correct choice from the following answers
A) 7
B) 8
C) 9
D) 10
E) 11

Rationale: "solution 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 = 27 ⇔ 5 x = 25 ⇔ x = 5 . hence , b ' s age = 2 x = 10 years . answer d"
Answer: D