题目内容
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Mary raises a herd of cows and feeds a total of m kilograms of feed a week. She feeds a cow a day with n kilograms of feed. How many cows does Mary have?
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A$$\frac{n}{7m}$$
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B$$\frac{mn}{7}$$
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C$$\frac{m}{7n}$$
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D$$\frac{7n}{m}$$
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E$$\frac{7m}{n}$$
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