That depends entirely on the SIZE of the tiles !
A tile size of 1 ft2 would need 112 tiles, whereas a tile size of 6in2 would need 448 !
Tiles that are two feet on a side cover 4 square feet. 378 of them cover 1512 square feet.
500/1.78 = 281 tiles
It depends on how big the tiles are.
It would be 9 tiles wide by 12 tiles long. That gives you a total of 108 tiles.
Assuming you mean 16x16 inches tiles... 441 tiles would cover the area exactly
You would need 29 tiles of that size to cover that area (28.77 tiles) to be precise,
You would need a total of 92 tiles. It would take just over 91 tiles to cover the area given.
104.0625 tiles exactly (so - 105 tiles in all)
To cover 720 sq feet of floor with 18" x 18" tile, you would need 320 tiles.