SOLUTION: Mary is three times as old as Jill. In five years, she will be twice as old as Jill. Find the present age of Mary.

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Question 1189011: Mary is three times as old as Jill. In five years, she will be twice as old as Jill. Find the present age of Mary.
Found 2 solutions by Alan3354, ikleyn:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
Mary is three times as old as Jill. In five years, she will be twice as old as Jill. Find the present age of Mary.
----------------
M = 3J
M+5 = 2(J+5)
etc

Answer by ikleyn(52788) About Me  (Show Source):
You can put this solution on YOUR website!
.

Jill is x  years old

Mary is 3x years old.


In 5 years

    3x + 5 = 2*(x+5).


Simplify and find x

    3x + 5 = 2x + 10

    3x - 2x = 10 - 5

       x    =    5


ANSWER.  Mary is 3x = 3*5 = 15 years old now.

Solved.