SOLUTION: Phil is three times as old as Carrie. Five years ago, phil was four times as old as Carrie was at that time. How old is Carrie now?

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Question 1010954: Phil is three times as old as Carrie. Five years ago, phil was four times as old as Carrie was at that time. How old is Carrie now?
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
y, Phil
x, Carrie

system%28y=3x%2Cy-5=4%28x-5%29%29


%283x%29-5=4%28x-5%29

3x-5=4x-20

-5=2x-20

15=2x

7.5

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!

Phil is three times as old as Carrie. Five years ago, phil was four times as old as Carrie was at that time. How old is Carrie now?
Let Carrie's current age be C

Then Phil's is: 3C

Therefore, 3C - 5 = 4(C - 5)

3C - 5 = 4C - 20

3C - 4C = - 20 + 5

- C = - 15

C, or Carrie's current age is: %28-+15%29%2F%28-+1%29, or highlight_green%2815%29