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81 inches
There are 36 inches in one yard. Therefore, 81 yards is equal to 81 x 36 = 2916 inches.
81 inches / 12 inches/foot = 6 feet 9 inches
5 ft + 20 inches = 6 ft + 8 inches.5 ft + 20 inches = 6 ft + 8 inches.5 ft + 20 inches = 6 ft + 8 inches.5 ft + 20 inches = 6 ft + 8 inches.
If the mulch is spread 4 inches thick, it will cover 81 square feet. 1 yard = 27 ft3 4 in = (1/3) ft 27 ft3 / (1/3) ft = 81 ft2