50 of them.
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We only need length times width to calculate area. Half a foot by 10 feet = 5 square feet. You'd need 60 of them to cover 300 square feet.
75 Get extra for breakage.
300 square meters = 3,229.17 square feet
110 x 300 feet = 33,000 square feet.
3600 / 12 = 300 tons