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daughter's age=x
father's age    =x+24

After 4years,
daughter's age=x+4
fathers age    = x+24+4

BUT acording to the sum
father's age will be 3times daughters age

father's age = 3[daughter's age]
x+24+4       = 3[x+4]
x+28           = 3x + 12
x-3x            = 12-28
-2x        =   -16
that is 2x =16
therefore fathers age is 24+x
daughter's age =8years
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