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Jacqueline was one-third as young as her grandmother 15 years ago. If the sum of their ages is 110, how old is Jacqueline's grandmother?

  • math -

    15 yrs ago:
    Jac --- x
    grandma -- 3x

    now
    Jac --- x+15
    grandma -- 3x + 15

    x+15 + 3x+15 = 110

    solve for x, then sub into 30+15

  • math -

    75

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