It is not possible to answer the question because the units of measurement for the tile are not given.
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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.
2 square feet per tile.
About 0.67 sq feet per tile.
A 24" by 18" tile is 432 square inches or three square feet.