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新东方OG中的新GRE数学题解析(1)

2015-12-31 17:30    新东方网

  3.Each employee of a certain company is in either Department X or Department Y, and there are more than twice as many employees in Department X as in Department Y. The average (arithmetic mean) salary is $25,000 for the employees in Department X and is $35,000 for the employees in Department Y. Which of the following amounts could be the average salary for all of the employees in the company?

  Indicate all such amounts.

  A $26,000

  B $28,000

  C $29,000

  D $30,000

  E $31,000

  F $32,000

  G $34,000

  本题我们要注意到题目中的more than twice的字眼,我们当做twice算的时候,结果是(25000*2+35000)/3约等于28333,因为有more than,所以选的答案要么是比前面这个数大,要么小,又由于more的是X部门的,那么肯定会将平均工资给拉低了,因此,选比前面那个数小的答案,AB都可以了。。

编辑:张雨


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