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Answer: Let Present age of father be x years. and present age of Son be y years.

Five years Ago , Father's age = x-5 Son's age = y - 5 According to Question , x - 5 = 7 (y -5 ) or x -5 = 7y - 35 or x =7y - 35 + 5 or x =7y - 30 --------------------------------------(ist)

Five Years Hence , Father's age = x+5 Son's age = y+5 According to question , x+5 = 3(y+5) x+5 = 3y + 15 or x = 3y +15 - 5 or x=3y +10 ....................................(2nd) From ist and 2nd we get 7y - 30 =3y + 10 or 7y - 3y = 10 +30 or 4y = 40 or y = 10 hence Present age of Son = 10 years Substitute y= 10 in equation ist , we get x = 7*10 - 30 or x= 70 - 30 or x= 40 Therefore Present age of Father = 40 years