The answer will depend on the units of measurement used for the numbers in the question: feet, metres, centimetres, miles, etc.
It is not clear what is meant by an "18x18 square feet" tile. 18ft * 18 ft = 324 square feet, so that one tile will be more than enough. An 18 inch by 18 inch tile cannot be a 18x18 square feet tile.
67 tile
To cover 720 sq feet of floor with 18" x 18" tile, you would need 320 tiles.
Each tile covers 2.25 square feet. This works out to 48 tiles plus spoilage.
18 x 18 (assumed inches) is actually 3/2 feet x 3/2 feet, thus the area of one tile is 9/4 square feet. To cover 150 square feet you would need (150)/(9/4) tiles which is (150) x (4/9) = 200/3 = 66.666, make it 67 tiles
how many 18 x 18 carpet tiles do you need for a 15 x 18 room
A 24" by 18" tile is 432 square inches or three square feet.
667 exactly, but you need to factor waste which for tile is 5 to 10% making it 733.
if you are quoting inches, then a 18x18 tile measures 2.25 square feet. On that basis you would need 106.66 or 107 to the nearest.
This scenario seems unlikely. As written, an 18 x 18 foot tile would cover 324 square feet and you'd only need a little more than one to do the job. Even an 18 sq. ft. tile would be unwieldy, although you'd only need 25 of them to cover the space. I'll assume you mean 18 x 18 inches, which is 2.25 square feet. You'll need 195 of those, but get 215 to be safe.
18 what cms or inches?? Probably inches so, Inches: 115.555556 tiles so about 116 tiles needed
576 feet x 12 inches in a foot = 6912 inches 6912 inches/18 inches per tile = 384 tiles