Linear feet and square feet are different units and cannot be directly converted
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12 in = 1 ft Volume = 311 sq ft × 2 in = 311 sq ft × (2 ÷ 12) ft = 51 5/6 cu ft (≈ 51.8 cu ft) = 51 5/6 ÷ 0.8 cu ft/bag = 64 19/24 bags ≈ 64.8 bags → you need to buy 65 bags.
5220.5 sq ft
19681.81 sq ft
3 sq yards = 3*9 sq ft = 27 sq ft
3100 of them.