Question

the product of riya's age(in years)5 years ago with his age(in years)9 years later is 15.find riya's present age.

Answer 1

I don't know how to help you. Any number missing or any part of question missing? Any way I can try.

present age of Riya = x

5years ago Riya's age = x -5

His age after 9 years = y

(x - 5 )  x  y = 15

15 has only 1, 3, 5, 15 as multiples

anyway his age should be minimum 9years so his age will be  15. So

Riya's age before 5 years = 1

Riya's present age = 6