270
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270 tiles exactly.
120
To cover 270 square feet = 250838 sq cm you will need 1742 tiles of 12 cm x 12 cm. This answer assumes that the area to be covered is "well-behaved" and that all offcuts are used. A 10% allowance for breakages and waste is advisable.
If you mean 16 ft x 16 ft then 2 tiles will suffice. If you did not mean 16 ft x 16 ft you could have considered mentioning what units of measurement you meant.
270 sq feet of whatever your covering it with. To find area, just multiply the 15' by the 18' and you have your answer. If your saying what you need to cover it with is 3' x 3' (such as tiles) then just divide 270 by 3 (which would mean you need 90 of them).