Assuming that you mean 20" x 20" (inch) tiles.
600 (square feet) x 144 (square inches in a foot) = 86400 square inches
1 tile = 400 square inches. (20 x 20)
86400 / 400 = 216 tiles.
This of course, assumes a square surface, which houses rarely are. ;)
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266.666666666 so rounding up 267 tiles.
75 square feet = 10,800 square inches divided by 18 = 600 tiles. Get extra for breakage.
a 20.5 inch tile has an area of 420.25 square inches. 600 square feet contains 86400 square inches so you would need 86400/420.25 = 206 tiles.
600 square meters = 6,458.35 square feet.
600 square feet.