Eight years from now, Carrie’s age will be twice Ben’s age. If Carrie’s current age is C and Ben’s current age is B, which of the following represents Carrie’s current age?

Explanation

Equate Carrie’s age in 8 years (C+8) to twice Ben’s age in 8 years (B+8), and then solve for C:
(C + 8)= 2(B + 8)
C = 2(B + 8)-8
C = 2B + 16-8
C = 2B + 8