SOLUTION: sonu's grandmother is 80 years old and sonu is 20 year old . how many years ago was his grandmother 7 times as old as sonu ?

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Question 1056532: sonu's grandmother is 80 years old and sonu is 20 year old . how many years ago was his grandmother 7 times as old as sonu ?
Answer by ikleyn(52787) About Me  (Show Source):
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sonu's grandmother is 80 years old and sonu is 20 year old . how many years ago was his grandmother 7 times as old as sonu ?
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80-x = 7*(20-x),

80-x = 140 - 7x,

7x - x = 140 - 80,

6x = 60,

x = 10.

Answer. 10 years ago. (They were 10 and 70 years old).