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Anup, Father are ages.

Anup + Father = 100

After (Father - Anup) years Anuj will be as old as him.
     Anuj + Father - Anup = Anup + 8

     Anup = 1/2 ( Anuj + Father - 4)

is there some problem with the data in the question. ??

sorry i missed some part in d question . i will write again