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First we need to calculate the square footage of the room. 15*20 = 300 square feet Now we need to know how many square feet each tile covers. 20" = 1.667~ square feet 1.6672 = 2.78 square feet. Now we divide the area of the tiles into the area of the room. 300/2.78 = 108 tiles. This gives the exact number of tiles you need mathematically. Realistically you need to account for cutting and breaking. It's safe to round that up to 120 tiles.
Tiles that are two feet on a side cover 4 square feet. 378 of them cover 1512 square feet.
You will need at least 17 30-inch tiles to cover 104 square feet. Each tile covers 6.25 square feet so you divide 104 by 6.25 which gives you 16.64 tiles. Add more tiles to allow for extras in case of damage to tiles during installation.
Well, isn't that a lovely question! To cover 15 square feet with 3x6 tiles, you would need 30 tiles. You see, each tile covers 0.5 square feet, so by dividing 15 by 0.5, you get 30 tiles. Happy tiling, my friend!
76.6 tiles