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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