Together, Jared's age and his granther's age total 100. But Jared's grandfather is 70 yrs. older than him. How old is Jared's grandfather?

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  1. Let G be grandfather's age; J is Jared's age.

    J + G = 100
    G - J = 30
    Add them together
    2G = 130

    Take it from there.

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