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 17, the how old is B?
A.	7
B.	8
C.	9
D.	10
Explanation: Choose the most appropriate option:  A) 6  B) 7  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 = 17 5 x = 15 x = 3 . hence , b ' s age = 2 x = 6 years . answer : option a
Answer: A