math
posted by Jaz .
Grandmother is 3 years younger than grandfather. Nine years ago, the sum of their ages was 105. How old are they?

math 
Reiny
Now:
grandpa  x
grandma  x3
nine years ago:
grandpa  x9
grandma  x3  9 = x  12
translate "Nine years ago, the sum of their ages was 105" into math
x9 + x12 = 105
carry on ....
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