2.25 square feet
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It is not clear what is meant by an "18x18 square feet" tile. 18ft * 18 ft = 324 square feet, so that one tile will be more than enough. An 18 inch by 18 inch tile cannot be a 18x18 square feet tile.
18 in/12 in/ft = 1.5 feet 1.5 x 1.5 = 2.25 sq ft per tile 130 sq ft/2.25 sg ft/tile = 58 tiles
18 inches = 1.5 foot18" x 18" = 1.5-ft x 1.5-ft = 2.25 square feet
To cover 720 sq feet of floor with 18" x 18" tile, you would need 320 tiles.
It would take approximately 311 tiles plus 5% to 10% waste depending on how you lay your floor out and how many cuts you will have.