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题目材料：
In 2000, the population density in Lake County was x people per square mile, and the population density in Osceola County was y people per square mile. What was the population density, in people per square mile, for the two counties combined?
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A. $$\frac{x+y}{2}$$
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B. $$\frac{x+y}{953+1,322}$$
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C. $$\frac{953+1,322}{x+y}$$
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D. $$\frac{953x+1,322y}{953+1,322}$$
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E. $$\frac{1,322x+953y}{953+1,322}$$
D显示答案
