The total age of A and B is 11 years more than the total age of B and C. C is how many year younger than A Choose the correct choice from the following answers:
A) 11  B) 12  C) 13  D) 14  E) 15

Rationale: "explanation : given that a + b = 11 + b + c = > a ? c = 11 + b ? b = 11 = > c is younger than a by 11 years answer : option a"
Answer: A