18 x 18 (hope these are in inches)
18" x 18" is the same as 3/2 feet x 3/2 feet and the area of one tile is 9/4 sq feet.
To fill 160 sq feet you would need (160)/(9/4) = 640/9 = 71.11 tiles and you need to round it up to 72 tiles.
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288
30 tiles! But you'll need more than 30 tiles to cover wastage, breakage, etc.
71 and 1/2 Get 80 to be safe.
To cover 720 sq feet of floor with 18" x 18" tile, you would need 320 tiles.
The answer will depend on the units used for measuring the tiles which you have failed to specify.