Well, 60, assuming the space was exactly x feet by y feet. Since it probably isn't, you'll need some extra for partials and waste, so figure about 70-75 to be safe.
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The tile is bigger than the area that you want to cover (12x12 > 10x11) so one tile will do. <><><><><> However, if you meant 12x12 INCH tiles, and a 10x11 FOOT room, you would need 110 tiles.
7200 of them.
There are 12 inches in 1 foot so each tile is 1x1 ft. This means nine tiles will fit along nine ft and twelve tiles will fit along twelve ft The area of this would be 9x12 Which is 108 In conclusion 108 12x12 in tiles will cover 9x12 ft
To cover 720 sq feet of floor with 18" x 18" tile, you would need 320 tiles.
I am going to assume that you mean 12in x 12in tiles. 12in x 12in tiles are 1 sq ft, so you would need 140 of them to cover 140sq ft. You may need more depending on the shape of the area to be tiled.