It is not clear from the question what "129 inches size" refers to. Is it one side of a tile, its perimeter, its diagonal?
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Depends on the size of the tiles.
To calculate the number of tiles needed, we first need to convert the room dimensions to inches. Since 1 foot is equal to 12 inches, the room size is 144 inches by 156 inches. Next, we calculate the area of each tile, which is 40 inches by 40 inches, equaling 1600 square inches. Dividing the total room area (22,464 square inches) by the tile area gives us approximately 14 tiles needed to cover the room.
18-in = 1.5 feet18-in x 18-in = 1.5-ft x 1.5-ft = 2.25 square feet48 tiles of this size have total area of (2.25 x 48) = 108 square feet
The smallest size would be 15x15 feet which is 225 feet2. That is 9, 5x5 feet tiles. Or it is 25, 3x3 feet tiles.
You would need 29 tiles of that size to cover that area (28.77 tiles) to be precise,