Each 17"x17" tile will cover 17/12 x 17/12 sq ft = 2.0069 sq ft
Then covering 255 sq ft will require 255/2.0069 = 127.06 = 128 tiles.
This number assumes that the shape is well-behaved (there are no wriggly edges or narrow left-over bits). that there are no breakages and that most off-cuts are used. In real life, therefore, you should allow at least 5% for wastage.
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576 feet x 12 inches in a foot = 6912 inches 6912 inches/18 inches per tile = 384 tiles
A 6 ft * 12 ft tile will cover 72 square feet.
To determine the number of 12x12 inch tiles needed to cover 400 square feet, first calculate the area of one tile in square feet. Each tile covers 1 square foot (12 inches x 12 inches = 144 square inches = 1 square foot). Then divide the total area to be covered (400 square feet) by the area of one tile (1 square foot) to find the total number of tiles needed. In this case, it would take 400 tiles to cover 400 square feet with 12x12 inch tiles.
A 4 inch by 4 inch tile is 16 square inches. 60 square feet is 8640 square inches. Dividing the one by the other shows us that 540 tiles 4 inches on a side will cover an area of 60 square feet.
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