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2016-02-22T11:52:00+05:30

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Let the son's present age be x years
his father 's present age be 45-x years
1) Son = X 

Father = 45 - X 

5years ago Son = ( X -5) 

Father = 45 - X - 5 = ( 40 - X) 

( X -5) ( 40- X ) = 4 ( 40 - X) 

X- 5 = 4 
X = 9 

ANSWER Son 9 years Father = 36 

CHECK 
5 years ago product of ages 4 X 31 = 124 

4 X fathers age 4 X 31 = 124 
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