Ah, what a lovely question! A 24x48 tile covers 8 square feet. You see, to find the area of a rectangle, you simply multiply the length by the width. So in this case, 24 multiplied by 48 equals 1152, which means the tile covers 1152 square inches.
2 square feet per tile.
About 0.67 sq feet per tile.
A 24" by 18" tile is 432 square inches or three square feet.
About 1.2 square feet x 63 tiles
1.78 square feet.
2 square feet per tile.
0.44444 square feet per tile.
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.
1.78 square feet
One square is equal to five square feet.
2.25 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.
15
About 1.2 square feet x 63 tiles