The total age of A and B is 10 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 answers:
A) 16
B) 12
C) 10
D) 20
E) 10

Rationale: "( a + b ) - ( b - c ) = 10 a - c = 10 answer is c"
Answer: C