It would depend on the precise layout of the room, and how well you can cut tiles if the room isn't some precise multiple of 1.5 feet.
In general, a tile that is 18 inches square covers 1.5*1.5=2.25 square feet. Disregarding tile fragments, 350 / 2.25 = 155.5555 tiles.
You would need a total of 36 tiles to cover that area.
168
123 will cover it. Get extras.
If the floor tiles are measured in inches and the room is measured in feet then the tiles are 1sq feet and the room is 6x8 = 48 sq feet so you would need 48 tiles.
210 tiles
You will need 233 30x30cm tiles to cover the room.
You would need a total of 36 tiles to cover that area.
168
12...
123 will cover it. Get extras.
Each tile will cover 2 square feet. So you will need 12.5 tiles.
If the floor tiles are measured in inches and the room is measured in feet then the tiles are 1sq feet and the room is 6x8 = 48 sq feet so you would need 48 tiles.
48 will cover it, get 52 in case of breakage.
210 tiles
Take the are of the room and divide it by 6 and there's your answer.If the room is 8 square feet you would need 32 tiles.If the room is 8 by 8 feet you would need 256 tiles.
12 inches = 1 foot Thus the tiles would be 1 foot square. You therefore need 30 to cover a 30 square foot room.
20" = 2.78 square feet. Now divide the area of the tiles into the area of the room. 140/2.78 = 51 tiles