The answer will depend on the size of the tiles and also the units used for the measurements of the room. It should be blindingly obvious to anybody that the answer for 12 ft x 10 ft and 12 metres x 10 metres will be very different.
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width times length 10 x 12 room needs 120 tile.
144 tile assuming you have no waste.
12" x 24" = 1' x 2' = 2 square feet per tile7' x 10' = 70 square feet on the floor of the roomAssuming that you only want to tile the floor, 70/2 = 35 tiles.
119
You need 225 tiles. :)