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550 sq feet = 550*12*12 = 79200 sq inches.

20"x20" = 400 sq inches.

So number of tiles required = 79200/400 = 198

That is the mathematical answer. It assumes that the 550 square feet shape is such that every offcut can be reused (not so easy if it is 550 sq feet in a circular shape!), that you cut every tile perfectly, there are no breakages, etc. In real life, depending on your level of skill, get at least 5% more tiles.

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Q: How many 20x20 inch tiles does it take to cover 550 square feet?
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