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Anonymous
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40, if it's exactly 5x8 and there's no cutting involved. So get at least 48.
25 will cover it. I'd get 28.
2/5 - 3/8 = (2x8)/(5x8) - (5x3)/(5x8) = 16/40 - 15/40 = 1/40
5 + 5 x 8 = 45
40 square feet