SOLUTION: Tom is three times as old as Mark. Twice Mark's age plus Tom's age is 90. How old is each person?

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Question 439785: Tom is three times as old as Mark. Twice Mark's age plus Tom's age is 90. How old is each person?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
Tom=3Mark
2Mark+Tom=90.
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Mark=1/3Tom
2/3Tom+Tom=90
5/3Tom=90
5Tom=270
Tom=54
Mark=18.