Algebra
posted by raeler .
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?

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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