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 choices
A) 12 B) 27 C) 21 D) 18 E) 11
(A+B) - (B+C) = 18   A - C = 18.   C is younger than A by 18 years.   Answer: 18
<result>D</result>
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 ?