How many 12 x 12 tiles to cover 220 sq ft?

Answer 1

It depends, first of all on the dimensions of each tile. The question states that the tiles are 12 x 12 but gives no indication whether those measures are inches or centimetres.

Assume, that the measurements ARE 12 inches x 12 inches.

Then each tile has an area of 1 ft x 1 ft which is 1 sq ft.

The minimum number of tiles required to cover 220 square feet = 220/1 = 220. However, that requires the further assumption that the area is well behaved and that there is no wastage. Unless the area is in the form of a rectangle with sides that are a whole number of feet, that will not happen. And when you need to cut tiles, you will have breakages, cut-offs that cannot be used and so on.

So, given two major assumptions, the answer is 220 tiles but, since neither assumption can be justified, I would suggest around 240 tiles.