Hi

(1/2)(3x + 25) = x + 25

    (3/2)x - x = 25 - 12.5

           .5x = 13.5

             x = 13.5/.5

             x = 27, Marla' age,  Grandma is = 81 

Answer by Alan3354(69443)   (Show Source): You can put this solution on YOUR website!
  Marla's Grandma is currently 3 times older than Marla, but 25 years

    from now Marla will be half her Grandma's age. How old is the

    Grandma right now?

=======================================

Now, G = 4M

In 25 years:

G + 25 = 2*(M + 25)

Sub for G

4M + 25 = 2M + 50

2M = 25

M = 12.5

G = 50 now

-------------------------

It's a non-integer answer, because 3 times older is not 3 times as old.

3 times older = 4 times as old.

---

1 times older = 2x as old.  If 1x older = 1x as old, then it's not older.

Or,

1 times older = a 100% increase, right? --> 2x as old





 

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