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?

1. Reiny

Now:
grandpa --- x
grandma --- x-3

nine years ago:
grandpa ---- x-9
grandma ---- x-3 - 9 = x - 12

translate "Nine years ago, the sum of their ages was 105" into math
x-9 + x-12 = 105

carry on ....

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