1,000 tiles.
395 tiles
If your tiles are 12 inches x 12 inches you would need 144 of them.
If the tiles are 12x12 inches square - you would need... 75 !
140
If the tiles are 12 inches square... 8352 tiles ! However if they're 12 feet square... 58 tiles
Assuming that 12 x 12 is 12" x 12" (one square foot), then 30 one-square-foot tiles would cover 30 square feet.
240
I assume you mean 12" x 12". That's a square foot, so 105 tiles cover 105 square feet.
2400 tiles if you don't get any extra
78.
317