6' x 9' (54 square feet) = 6 square yards of tiles needed.
18*18 is 324in2. This is 0.25 square yards. So you need 4 tiles
17 and 1/3 square yards.
the answer is 40 square yards
22.2 tiles so buy 23 tiles.
49 tiles
5,184 2-square-inch tiles are needed.
236 18-inch tiles.
10 000
240 square tiles are needed
8 square yards
266.666666666 so rounding up 267 tiles.