Each tile is one square foot. So you need 126 of them, but allow for spoilage.
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80 if the tiles are 12x12 - 12x12 is one square foot covering 80 you would need 80 tiles
375
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?
36 tiles. I would hire a tiler if I was you, this doesn't sound like your 'thing'
A 12 x 12 tile covers one square foot. So you need 432 of them, plus some for spoilage.