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792 would be what calculates but it depends on the exact measurements of the 220 square feet.
Any reason why it shouldn't be 220, apart from the shape of the area?
220 inches
220 x 144 = 31,680 sq inches / 324 (18" x 18") =97.7 + 30% waste = 130 tiles
220 x 3 = 660 feet