Ah, what a lovely question! To find out how many tiles you need for a 225 sq ft room, you first need to know the size of the tiles you'll be using. Let's say your tiles are 1 sq ft each, then you would need 225 tiles to cover the entire room. It's all about finding the right balance and harmony in your tile placement. Happy tiling, my friend!
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You do not say what size the tiles are - 330x330mm or 450x450mm or 600x300mm or 331x248mm or 200x100mm or 630x210mm or 100x100mm or 150x100mm
You need 225 tiles. :)
120"*120" is 14400 sq. in. 15"*15" is 225 sq. in 14400/225=64 tiles..
Each tile is 1 square foot.
Whom ever wrote this problem, did not give the unit of measurement (yards, feet, meters, etc.) so, I am going to presume that the 12 by 12 tile is in inches, and the 15 by 15 is in feet. If my presumption was correct the answer is 15 tiles. Because a 12 by 12 tile is = to 1 square foot. How many 1's fit into 15? 15! Well, not exactly..... You need to multiply 15 X 15 to get the square footage and that will give you the number of tiles needed since the tiles are 1 ft square. 15 x 15= 225. So you need 225 tiles. And add extra tiles for breakage...
Approximately 150 tiles. I would buy 120 at least if possible to start with and if you come up short, the balance of what you need should be easy to figure. If you're buying a stock tile it should be no problem to either return extra for credit or buy more.