18 inch x 18 inch tile is really (1 and 1/2) feet by (1 and 1/2) feet
That is (3/2) x(3/2) square feet = 9/4 square feet.
To cover 900 square feet we need (900)/(9/4) = (900) x (4/9) = 100 x 4 = 400 tiles
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67 tiles.
288
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.
18x18 what? 18 feet x 18 feet? 18 microns x 18 microns?