The answer will depend on the size of the tiles.
The amount of tiles needed to cover a floor will depend on the size of the floor.
240 square tiles are needed
It should take about 825 1 foot square tiles to cover a floor with those dimensions. This assumes roughly a 10% waste factor.
157 18 by 18 tiles are needed to cover 352 square feet.
you need to know how wide the floor is in addition to how long. Number of tiles is lenght x width
5,184 2-square-inch tiles are needed.