Posted by raeler on .
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?

Algebra 
drwls,
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.