360 square feet.
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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?
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.
You calculate the sqft of the room, a sqft is still a sqft no matter what the tile dimensions are