Depends on the size of the tiles.
128.2 tiles
If the floor tiles are measured in inches and the room is measured in feet then the tiles are 1sq feet and the room is 6x8 = 48 sq feet so you would need 48 tiles.
205.3125 tiles exactly OR 206 tiles, with a bit left over!
To cover 720 sq feet of floor with 18" x 18" tile, you would need 320 tiles.
240
Depends on the size of the tiles.
5.8
128.2 tiles
If the floor tiles are measured in inches and the room is measured in feet then the tiles are 1sq feet and the room is 6x8 = 48 sq feet so you would need 48 tiles.
205.3125 tiles exactly OR 206 tiles, with a bit left over!
To cover 720 sq feet of floor with 18" x 18" tile, you would need 320 tiles.
675 of them. Get extra for breakage.
1.5 tiles. (I know it's unusual, but it's true.)
240 square tiles are needed
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6' x 9' (54 square feet) = 6 square yards of tiles needed.