A measurement of 400 square feet is an area which is measured by multiplying the width by the length to reach a total of 400. An area 10 feet by 40 feet would be equal to a total of 400 square feet.
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One 18 inch x 18 inch tile = 1.5 ft x 1.5 ft = 2.25 sq ft.400 sq ft x 1 tile/2.25 sq ft = 177.77 = 178 tiles
6 x 24 inch tile = 144 sq in = 1 sq ft 400/1 = 400 tiles
One gallon covers 400 sq ft on a smooth surface one coat. For rougher surface, much less per gallon, 200-300 sq ft oer coat. One gallon costs between $20-$50 depending on quality.
If you are talking house wise...400 sq is incredibly small...most likely a one floor house. One room probably.
5500 sq ft = 511 sq metres, approx. 5500 sq ft = 511 sq metres, approx. 5500 sq ft = 511 sq metres, approx. 5500 sq ft = 511 sq metres, approx.