SOLUTION: Devin is 90 years younger than Sonya. 3 years ago, Sonya's age was 4 times Devin's age. How old is Devin now?

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Question 1052273: Devin is 90 years younger than Sonya. 3 years ago, Sonya's age was 4 times Devin's age. How old is Devin now?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
D=S-90
Three years ago,
S-3=4%28D-3%29
S-3=4D-12
S=4D-9
Substituting from above,
D%2B90=4D-9
-3D=-99
D=33