A 3x12 room is 36 square feet. This means that to fill the floor in the 3x12 room, it will take 36 tiles that are each 1 square foot (12x12) in size.
40
144
122
144 tiles
154
it will cover a 12x12 room
144 sq ft
2o
It is 144 square feet.
That depends on the size of the room but as a general rule I would say 12x12 laid with a grout line 1/8th or smaller on a diagonal or a mosaic that's 2x2 or smaller with a grout color closely matching the mosaic.
It is a size of 12x12