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18 inches = 18/12 ft 14 inches = 14/12 ft (18/12) x (14/12) = (18 x 14) / (12 x 12) = 252/144 = 1.75 ft2
1 ft = 12 in → 18 ft 11.5 in = 18 × 12 in + 11.5 in = 227.5 in
216 square feet (12 x 18 = 216)
216 / 12 equals 18
222 (12 x 18 + 6)