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 47, then how old is B?	Choices:
A) 17 years
B) 19 years
C) 18 years
D) 10 years
E) 12 years

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 : c"
Answer: C