Question 646894
i have 540 sq ft of floor to cover with tiles.
each tile is 20.5" by 20.5"
How many tiles do i need? 

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area of each time: 20.5^2 = 420.25 sq inches
420.25 sq in (1 ft/12 in)^2 = 420.5/144 = 2.918 sq ft.
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# of tiles = 540/2.918 = 185.03
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Cheers,
Stan H.