The total age of A and B is 18 years more than the total age of B and C. C is how many years younger than A.? Choose the correct choice from the following options: A) 16 B) 12 C) 15 D) 18 E) 10

Rationale: "( a + b ) - ( b - c ) = 18 a - c = 18 answer is d"
Answer: D