To make a certain type of ale, a brewery must mix enzymes, flax, and barley in the proportion 3:5:7 by volume. What is the largest amount in cubic meters of this mixture the brewery can obtain with one cubic meter of enzymes?
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A$$\frac{4}{5}$$
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B$$\frac{5}{3}$$
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C$$\frac{7}{3}$$
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D4
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E5
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正确答案: E