The total age of A and B is 12 years more than the total age of B and C. C is how many years younger than A ?
Choose the correct option:  A) 12  B) 27  C) 21  D) 18  E) 11
(A+B) - (B+C) = 12   A - C = 12.   C is younger than A by 12 years.   12nswer: 12
<result>A</result>
The total age of A and B is 12 years more than the total age of B and C. C is how many years younger than A ?