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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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