Question 873383
 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?
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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
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It's a non-integer answer, because 3 times older is not 3 times as old.
3 times older = 4 times as old.
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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