18"*18" = 1.5 ft * 1.5 ft = 2.25 sq ft
To cover 120 sqft you would require 120/2.25 = 53.33 ir 54 tiles.
That answer is correct as a mathematical exercise, but in real life, the number of tiles depends upon the exact dimensions of the 120 sq ft area. It also assumes that all offcuts can be used and that there is no wastage. These are rather unrealistic assumptions so you should allow 5-10% extra.
113 tiles
55 tiles
Depends on the size of the tiles.
270 tiles exactly.
297 16x16-inch tiles.
113 tiles
55 tiles
56 tiles to cover 224 square feet.
1296 Tiles
Depends on the size of the tiles.
270 tiles exactly.
236 18-inch tiles.
18 10x10-inch tiles.
125 16-inch tiles.
297 16x16-inch tiles.
It would be 9 tiles wide by 12 tiles long. That gives you a total of 108 tiles.
You will need 44 six inch tiles to cover 11 square feet.