Question
When 15 years ago age of Dev was divided by 20, the
present age of his granddaughter Swati is obtained. If Swati is 6 years younger than her sister Neha whose age is 9 year, then what is Dev’s present age?Solution
Swati’s age = (6-9) = 3 years Let age of Dev = x years So,  
= 3 => x = 60 + 15 = 75 years
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