You need to carpet a new office room. The new room is 12 feet by 15 feet 6 inches. A supplier delivered 20 square yards of carpet tiles.Do you have enough tiles to do the job? How much more or less do you need?

Area of the room = 12 * 15.5 = 186 square feet

This equals 186 / 9  = 20 2/3 square yards

So you have not got enough capet tiles  to do the job.

You need another 1 carpet tile to finiush the job.