There are 324 square feet
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20 x 18 = 360
18-ft x 18-ft = 324 square feet
18 inches = 1.5 foot18" x 18" = 1.5-ft x 1.5-ft = 2.25 square feet
18 inches is 1.5 ft and so 1.5 times 1.5 = 2.25 square ft
Answer:18' x 15' = 270 ft²270 ft² x 0.092903 = 25.0838 square meters.