Age practice problem

Question

The sum of the ages of Blake and Mackenzie is 68 years. 8 years ago, Blake's age was 3 times Mackenzie's age. How old is Blake now?

Answer 1

B+M = 68

B-8 = 3(M-8)

B-8 = 3M- 24

B = 3M - 16

B = 68 -M

3M - 16 = 68 -M

4M = 84

M =21

B = 68-21 = 47 years old for Blake now