Hi

A man is three times the age of his daughter

 Let x and 3x represent the ages of the daugter and father respectively

Question states***in ten years time the sum of their ages will be 76 years 

 (x+10) +(3x+10) = 76 is the Expression

      4x = 56

       x = 14, the daughter's age.  The father is 42.

 

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