Chris mixed 3 pounds of raisins with 4 pounds of nuts. If a pound of nuts costs 3 times as much as a pound of raisins, then the total cost of the raisins was what fraction of the total cost of the mixture?
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A$$\frac{3}{7}$$
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B$$\frac{1}{3}$$
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C$$\frac{1}{4}$$
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D$$\frac{1}{5}$$
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E$$\frac{1}{7}$$
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正确答案: D