Rahim has purchased 36 centre tiles and 60 outside tiles. how many terms can he create in this pattern with the number of tiles provided?

in this case best to picture the answer.

the center has to be 36 so the center is

1x36 or 2x18 or 3x12 or 4x9 or 6x6 

now just figure out which ones of those will 60 tiles fit perfectly around the outside.