Question

Alina and Joe are both thinking of the same positive number. Alina tells Joe that her number is a factor of 9, while he tells her that it is a factor of 12. If the number is not 1, what is it?

Answer 1

It is 3, given that

`3 * 3 = 9`
and

`3 * 4 = 12`

Answer 2

9 and 12 have a factor of 3