12.2222
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18 feet, 4 inches, or 18.3 feet.
220
There are 12 inches in a foot. 18 feet * 12 inches each equals 216 inches in 18 feet.
220 x 144 = 31,680 sq inches / 324 (18" x 18") =97.7 + 30% waste = 130 tiles
There are 12 inches in one foot. Therefore, 18 feet is equal to 18 x 12 = 216 inches.