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Let d present age of father be x yrs
n present age of son be y yrs
case1:5 yrs ago :
fathers age was (x-5)yrs
n sons age was (y-5)yrs
(x-5)=3(y-5) ............-eq1
case2:10 yrs later:
fathers age will be x+10
n sons age will be y+10

x+10=2 (y+10)..........eq2
solve for x and y by any method
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