120
You will need approximately 23.4 tiles, so 24 tiles. Assuming 13x13 tiles is in inches.
75, 6.25 12 x 12 ft tiles to cover surface of 900 ft2
Each tile will be one square foot. So you have 135 square feet.
A 12x12 inch tile covers one square foot. You will need 24 of them, plus a few for spoilage.
36 tiles. First you have to convert 20 inches to feet. There are 12 inches in a foot so 20/12 means you have one and two-thirds length tiles. Then, you have to figure out the lenght of the sides of the room which is the square root of 100 sq ft. which is 10 feet long. Now, you have to figure out how many tiles it will take to do one length of the room by 10/one and two-thirds which is 6 tiles. Finally you have to multiply the length times the width to get how many tiles it takes to fill the room by 6*6=36 tiles
If they are 12 inches x 12 inches then you would need 399 tiles.
If your tiles are 12 inches by 12 inches they are equal to 1 sq ft, so you would need 54 tiles.
If the tiles are 12 inches square... 8352 tiles ! However if they're 12 feet square... 58 tiles
195 12 inches x 12 inches is 1 square foot
120
204 tiles.
1540
180
It depends on whether the 12x12 tiles are measured in inches, centimetres or ssome other measure. The criticalinformation is not provided in the question so it cannot be answered.
If you're talking floor tiles as opposed to wall tiles and by 12x12 you mean they are 12 inches square, then the answer is 300. Because each tile is one square foot and a 15'x20' room is 300 square feet. Simple, eh?
If the tiles are 12x12 inches square - you would need... 75 !
If 12x12 is 144... There would be 144 tiles in a box right?