It takes 1 pound of flour to make y cakes. The price of flour is w dollars for x pounds. In terms of w, x and y, what is the dollar cost of the flour required to make 1 cake?
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A$$\frac{xy}{w}$$
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B$$\frac{y}{wx}$$
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C$$\frac{w}{xy}$$
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D$$\frac{wx}{y}$$
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Ewxy
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正确答案: C