The answer will depend on the size of the tiles. Since there are no units given, the fact that the tiles are 18*18 is useless for answering the question.
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157 18 by 18 tiles are needed to cover 352 square feet.
To cover 720 sq feet of floor with 18" x 18" tile, you would need 320 tiles.
You will need at least 67 tiles. This will cover 150.75 square feet.
18*18 = 324 tiles.
18..
157 18 by 18 tiles are needed to cover 352 square feet.
236 18-inch tiles.
110 tiles
To cover 720 sq feet of floor with 18" x 18" tile, you would need 320 tiles.
You will need at least 67 tiles. This will cover 150.75 square feet.
18*18 = 324 tiles.
You would need a total of 92 tiles. It would take just over 91 tiles to cover the area given.
18*18 is 324in2. This is 0.25 square yards. So you need 4 tiles
18..
120
You would need 100 tiles - and have some fragments left over.
Assuming you mean 18 inch by 18 inch, you will need 133 and 1/3 tiles.