<PRE><B>Question 1056533</B>
Today grandma is 80 and Sonu is 20. This is smoke screen information, you don&#39;t need it.
:
Here is what we have to find:
find when 
80-x = 7(20-x)
80-x = 140-7x add 7x and subtract 80 on both sides
6x = 60
x = 10 10 years ago is our answer
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Check:
10 years ago, grandma was:
80-10 = 70
and Sonu was:
20-10 = 10
Grandma was 7 times older than Sonu, so Sonu times 7 = grandma:
10*7 = 70 Correct</PRE>