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

  • math -

    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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