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题目材料：
If the average age of production, administration, and finance is x, y, and z in site 2, what is the average of all employees in site 2?
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A.x+y+z
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B.0.3x+0.3y+0.4z
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C.$$\frac{(0.3x+0.3y+0.4z)}{3}$$
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D.$$\frac{(x+y+z)}{3}$$
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E.(0.3x+0.3y+0.4z)*1530
B显示答案
