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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.$$\frac{7m}{n}$$
C显示答案
