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.
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Two tiles of size 12 ft x 12 ft will cover 288 square feet and so should be sufficient.
A A 12x12 sq feet tile covers 144 sq feet. So to cover 1200 sq feet you will need 1200/144 = 8.3 or 9 tiles.
If the tiles are 12 inches square... 8352 tiles ! However if they're 12 feet square... 58 tiles