Dennis is thinking of two number. the only common factors of the number are 1 and 3.thier first common multiple is 18.one of the number is 9. what is the other number?

I would say 6 and 9.

Hope this helps !

Photon

The other Number would be 6 due to the fact that since 1 of them is 9, you eliminate the numbers 18, 9, and 3, since they wouldn't meet the qualifications. Therefor, it must be 6 to have common factors 3 and 1, and the LCM ( Least Common Multiple ) will be 18

Im pretty sure it would be 6 purple rectangles.