math

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

asked by Jaz
  1. 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 ....

    posted by Reiny
  2. X-9+x-12=105
    X+x=105+9+12
    2x=126
    X=63

    Grandmother x-3
    63-3=60

    Grandfather x
    63

    posted by Chloee

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