144 square feet
The answer depends on the measurement units used for "12x12": feet, metres, yards or some exotic measure? Without that information the question cannot be answered.
None. It can be written in square inches though. To convert square feet to square inches, multiply by 144 (one square foot is 12x12 square inches).
So each tile is 12" by 12" square, right? So each tile is ONE square foot? (a perfect square that's a foot long and a foot wide). Each tile is one square foot and you need to know how many add up to 400 square feet. I think the answer is the square root of Pi.
13.93 square meters.
It is 144 square feet.
144 12x12
A 3x12 room is 36 square feet. This means that to fill the floor in the 3x12 room, it will take 36 tiles that are each 1 square foot (12x12) in size.
144 !
123 will cover it. Get extras.
144 square feet. Just multiply length by width - the answer is the square footage.
144 square feet
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?
144 square feet.
144 square feet
Multiply the two dimensions to get the area. The calculation will give you 144 square feet.
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?