Answer: 184 assuming no waste... There will be waste and broken tiles. Get an extra case.
Math:
13in X 13in = 169 Square inches
169 Square inches / 144 Square inches per square foot = 1.17 square foot per tile
215 square feet / 1.17 square feet = 184 tiles
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About 1.2 square feet x 63 tiles
The best way to figure out how many 13x13 tile will be needed to cover 30 sf of floor is to calculate 13x13/144 give coverage per tile (1.1736), then take 30/1.736 = 25.56 tiles.
190
It will require a minimum of 1,462 tiles. That number will cover about 1,850.34 square feet.
90 tiles.