27 ft * 4 ft = 108 sq ft = 10.03 sq metres
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There are 594 square feet.
378
One square yard is nine square feet, so 27 square feet is equivalent to 3 square yards. So 3 yards of concrete will cover 27 square feet.
27 square feet at 1 f thick
Nine in each square foot. (27 times 9 equals 243).