The total age of A and B is 13 years more than the total age of B and C. C is how many years younger than A?
Choose one:  A) 13  B) 24  C) c is elder than a  D) data inadequate  E) none

Rationale: "solution [ ( a + b ) - ( b + c ) ] = 13 â € ¹ = â € º a - c = 13 . answer a"
Answer: A