2.007 sq ft
One 18 inch x 18 inch tile = 1.5 ft x 1.5 ft = 2.25 sq ft.400 sq ft x 1 tile/2.25 sq ft = 177.77 = 178 tiles
A 12x24 inch tile equals two square feet.
The number of tiles required will be different if they are 20 inch x 20 inch tiles rather than if they are 20 cm x 20 cm tiles. Also, the answer depends on whether the room is 12 foot by 8 ft or 12 metres x 8 metres. In the extreme case, you would need only a single 20 ft x 20 ft tile for a room that is 12 ft by 8 ft.
6 feet by 1.5 feet would be 16 9-inch tiles
18 in/12 in/ft = 1.5 feet 1.5 x 1.5 = 2.25 sq ft per tile 130 sq ft/2.25 sg ft/tile = 58 tiles
What are dimensions of the tile? You usually multiply two sizes of the tile (they are in inch so you convert them in feet) and obtain the sq ft of a tile, and than multiply with the number of tiles that you have.
420. Get 450 to be safe.
20 (ft pounds) = 240 inch pounds
A quarter of one tile (6 ft * 20 ft) will be sufficient!
A 12 inch by 12 inch tile is 1 ft by 1 ft, which is 1 square foot. So you would need 120 tiles.
A 24 inch tile x 24 inch is 2 ft by 2 ft = 4 square feet 648/4 = 162 tiles