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 47, then how old is B?
Choose the correct choice
A) 7  B) 8  C) 9  D) 18  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 = 47 5 x = 45 = > x = 9 hence , b ' s age = 2 x = 18 years . answer : d
Answer: D