Question 170035
Mr. Scott is three times as old as Betty. In eight years the sum of their ages will be 64. How old is Betty now?

Betty's age = x

Scott's age = 3x

(x + 3x) + 8 years = 64

4x + 8 = 64

4x = 64 - 8

4x = 56

x = 56/4

x = 14

Betty is 14 years old.

Scott is 14 times 3 or 42 years old.