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...
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13 boxes with 13 tiles in each
The tile is bigger than the area that you want to cover (12x12 > 10x11) so one tile will do. <><><><><> However, if you meant 12x12 INCH tiles, and a 10x11 FOOT room, you would need 110 tiles.
123 will cover it. Get extras.