Question

The product of Tom's age 5 years ago and his age 10 years later is 16. Determine is present age

Answer 1

Lets say tom's present age is=X
so according to question(x-5)(x+10)=16
= x^2+10x-5x-50=16
=x^2+5x-66=0
factors are -11 and 6
As age cannot be negative, answer is 6 years