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题库 / Prep2007E2-PS-85
Of the 800 employees of Company X, 70 percent have been with the company for at least ten years. If y of these "long-term" members were to retire and no other employee changes were to occur, what value of y would reduce the percent of "long-term" employees in the company to 60 percent?
200
160
112
80
56
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我艹......分子分母都要减Y
我也也觉得很艹蛋
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分子分母都要减去这个未知数啊
分母分母。
分子分母都要见
(800*0.7-Y) / (800-Y) = 0.6 Y=200
be careful Y is an amount instead of a %. (800*0.7-y)/800-y=0.6