A boy's grandmother is 80 yrs old and the boy is 20 yrs old. how many years ago was his grandmother 7 times as old as boy?

Answers (1)

Let x years before the grandmother is 7 times old as the boy. Therefore

80-x=7(20-x)

80-x=140-7x

-x+7x=140-80

6x=60

x=10

10 years before grandmothers age is 80-10=70 and the age of boy = 20-10=10 and also 70=7 x 10

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