SOLUTION: Mary is 3 times as old as her brother John. In 5 years, Mary will be twice as old as John. How old is Mary now?

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Question 739227: Mary is 3 times as old as her brother John. In 5 years, Mary will be twice as old as John. How old is Mary now?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
m=3j,
(m+5)=2(j+5)
m=15 j=5