A 3 inch by 6 inch tile covers 18 square inches which converts to 0.125 square feet.
35 square feet divided by 0.125 square feet is 280 tiles. This does not take into the consideration the area taken up by grout between the tiles and putty at the ends so it will probably be less than 280 tiles.
But unless the area to be covered exactly matches a layout of the tiles, some tiles will have to be cut to fit against the edges. Some will break or be miscut so you should probably get about 300 tiles.
You can keep the extra in case some break accidentally or most stores will accept return of the unused tiles.
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Te asnwer depend on the units of measurement for the tiles as well as the shape of the area to be covered. A circular shape, for example, will require many tiles to be cut and it may not be possible to use the offcuts, because they will be concave.
There are 4 tiles of 3 inches by 6 inches in 1 square foot. Each tile covers an area of 0.5 square feet, so in 1 square foot you can fit 4 of these tiles.
180 square foot = 25920 square inches
13 inch by 13 inch = 169 square inches
Therefore 25920 / 169 = 153.3727810650888
so you will need 154 tiles to cover the area.
A one square foot tile would be 12 inches on a side. That means it would take 6 tiles. Multiply it out would be 36 2 inch tiles.
It takes 4 6x6 inch tiles to cover a square foot. You will need 180 tiles, plus some for spoilage and mistakes.
You would need 138 tiles to cover 115 square feet with 12-inch tiles. To calculate this, divide the total square footage (115) by the area of one tile (1 square foot for a 12-inch tile). So, 115 (sq ft) / 1 (sq ft per tile) = 115 tiles.
A 12 by 12 inch tile is one square foot. That means it will take 650 tiles, plus spoilage and trim.
A 12x12 inch tile covers one square foot. You will need 24 of them, plus a few for spoilage.
1 foot = 12 inches Answer = 265/12 x 18/12 = 33.125 sq feet = 34 sq feet tiles