Devaughn's age is three times Sydney's age. The sum of their ages is 92. What is Devaughn's age?
Dev is 69 and Syd is 23.
Let Dev's age be
Since Dev is 3 times older than Syd, we may write
Since the sum of their ages is 92, we may write
Now replacing x with 3y, we get :
Back substituting we get Dev is 69 years old.