A 19.75 x 19.75 inch tile covers 390.0625 square inches, or 2.70877 square feet (divide by 144, which is 122, since we're working in square quantities). 1000 / 2.70877 = 369.171 tiles to cover the given area. (Were you to purchase tiles to actually do this, you'd haver to buy at least 370 tiles, since you can't buy 0.171 tiles.)
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Just multiply 20 by 20 to find that each tile has 400 square feet to it. Then divide 1000 by 400 to find that you'll need 2.5 tiles -- so you should buy three.
1000 square feet of sod, or 111 square yards
Area of each tile = 30*30 = 900 mm2. Area to be covered = 1000*1000 = 1,000,000 mm2 So, number of tiles required = 1,000,000/900 = 1111.11... tiles.
3000 sq ft * 4 inches = 1000 cubic feet.
250 tiles