SOLUTION: Mark is 3 times as old as Julie. The difference in their ages is 10 years. What is Mark’s age?

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Question 722569: Mark is 3 times as old as Julie. The difference in their ages is 10 years.
What is Mark’s age?
Answer by god2012(113) About Me  (Show Source):
You can put this solution on YOUR website!
Let 'M' and 'J' are the ages of Mark and Julie respectively.
Given :
M = 3J
M - J = 10 or J = M - 10
M = 3 (M+10) = 3M - 30
2M = 30 or M = 15 years