120 tiles
assuming you mean 10" by 10" tiles, 200
Is the room 10 by 6 inches? If so you need 5 12 inch tiles. If it is 10 by 6 feet then the answer is 60.
180
3/10 of a tile
50
About 195
70 tiles. Add an additional 10% for cuts.
Assuming the tiles are 1 foot squares, you would need 10*15 = 150 tiles.
Your question is confusing because you are using two different scales. If your room is 10 ft x 12 ft and the tiles are 2 ft x 2 ft, the answer is 30 tiles.
It depends on whether the tiles are 18 inch * 18 inch or 18 cm * 18 cm, etc. And also on whether the room is 10ft *10ft or 10 yards*10 yards or 10 metres*10 metres etc.
144/(1.5*1.5) = 64 tiles, but if you are using this to determine how many are needed to tile a room, you need to add at least 10% for edging around the room. So, you probably need at least 71 or more tiles.
178 Tiles If the square footage is the actual room size you add 10% for wastee