24x24 inch tile equals 4 square feet 275/4 = 68.75 You would need 69. (24x24 inch tiles to cover 275 sqft)
0.44444 square feet per tile.
4.
A 6 ft * 12 ft tile will cover 72 square feet.
It is not clear what is meant by an "18x18 square feet" tile. 18ft * 18 ft = 324 square feet, so that one tile will be more than enough. An 18 inch by 18 inch tile cannot be a 18x18 square feet tile.
A 24x24 inch tile would be four square feet. 140 divided by 4 would be 35 tiles.
You will need 47 tiles.
24x24 inch tile equals 4 square feet 275/4 = 68.75 You would need 69. (24x24 inch tiles to cover 275 sqft)
A 24x24 tile is 4 square feet. You would need 105 of them.
2 square feet per tile.
0.44444 square feet per tile.
4.
For area measurements, you multiply the length by the width. Here the calculation gives you an answer of 240 square feet. Each tile covers 4 square feet, so you would need 60 tiles plus spoilage.
About 0.67 sq feet per tile.
Another 53.75 square feet of tile would be needed.
A 6 ft * 12 ft tile will cover 72 square feet.
A 24" by 18" tile is 432 square inches or three square feet.