The total age of A and B is 15 years more than the total age of B and C. C is how many year younger than A
Options
A) 11  B) 12  C) 13  D) 14  E) 15

Rationale: "explanation : given that a + b = 15 + b + c = > a ? c = 15 + b ? b = 15 = > c is younger than a by 15 years answer : option e"
Answer: E