67 tiles.
288
266.666666666 so rounding up 267 tiles.
10
The answer will depend on the units used for measuring the tiles which you have failed to specify.
67 tiles.
start with 38 tiles.
192 tiles
The answer depends on the measurement units used for 18x18.
22.2 tiles so buy 23 tiles.
288
118
266.666666666 so rounding up 267 tiles.
12...
10
The answer will depend on the units used for measuring the tiles which you have failed to specify.
18" x 18" = 1.5' x 1.5' = 2.25 square feet90/2.25 = 40 tiles.