The total age of A and B is 17 years more than the total age of B and C. C is how many years younger than A ?	Options
A) 12	B) 27	C) 21	D) 17	E) 11

Rationale: "( a + b ) - ( b + c ) = 17 a - c = 17 . c is younger than a by 17 years . answer : d"
Answer: D