67 tiles.
10
100 tiles or 96 which is the correct amount
288
You'll need 200 18-inch tiles.
The answer depends on the measurement units used for 18x18.
22.2 tiles so buy 23 tiles.
192 tiles
67 tiles.
start with 38 tiles.
220
10
100 tiles or 96 which is the correct amount
102.22 tiles because each tile is 2.25 sq.ft. 230 / 2.25 =102.22 so really 103 tiles.
118
288
You'll need 200 18-inch tiles.