12 x 12 tiles cover 144 ft2, so the number of tiles needed is 1800/144, which equals 12.5.
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Tiles that are two feet on a side cover 4 square feet. 378 of them cover 1512 square feet.
Assuming the tiles are 6" x 20", the area of 1 tile = 1/2 x (1 and 2/3) = 1/2 x 5/3 square feet which is 5/6 square feet. To cover 1800 sq ft, the number of tiles required is 1800 / (5/6) = 1800 x 6/5 = 360 x 6 = 2160
76.6 tiles
67 tiles.
157 18 by 18 tiles are needed to cover 352 square feet.