Approx 4.5 square metres.
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40 square feet.
4 ft * 8ft = 32ft
27 ft * 4 ft = 108 sq ft = 10.03 sq metres
U need 1.63 80lb bags per square ft so 131bags to do 8ft by 8ft
convert the inches to feet Hence 90 inches = 7 ft 6 inches = 7.5 ft. 107 inches = 8ft 11 inches. = 8.91666.... ft Hence 7.5 ft X 8.916666... ft = 66.875 sq.ft.