题目信息
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?
A:$$\frac{3}{7}$$
B:$$\frac{1}{3}$$
C:$$\frac{1}{4}$$
D:$$\frac{1}{5}$$
E:$$\frac{1}{7}$$
参考答案及共享解析

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已选答案:
正确答案:
D:$$\frac{1}{5}$$
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