Question 979689
Let present age of Sanjay be 'x'
     Present age of his son Anand be 'y'
     So, by question 
                X=9y..... (i)
     After 5 years, x+5=4(y+5)..... (ii)
   Solving eq^ns (i) and (ii)
We get
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X =27 years i.e. present age of sanjay
y=3 years i.e. present age of anand