150
12*12=144 square inches
150 square feet =21600 square inches
21600/144=150
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1540
650
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