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1.In a certain company, the total monthly payroll for the 12 production workers is $18000 and the total monthly payroll for the 36 office workers is $63000. By how much does the average (arithmetic mean) monthly salary of an office worker exceed that of a production woker in this company.
A. $62.50 B.$187.50 C.$250.00 D. $375.00 E. 500.00
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答案为C.
我怎么算都不得250~不知道是不是我理解错误。我的理解是36office worker并没有包含production worker (production worker 的工资计入生产成本，而office worker的工资则计为管理费用。我是这么理解的。）那计算office worker 的平均工资，就用63000/36=175. 没有这个答案
那它既然强调不包括production worker.那人数就36-12. 工资63000-18000=45000. average=45000/24=187.5 选b.
所以我实在不知道怎么算得250的，请个位大神指教。
2.Of the science books in a certain supply room, 50 are on botany, and 110 are on chemistry. If sicence books are removed randomly form the supply room, how many must be removed to ensure that 80 of the books removed are on the same science?
A.81 B.159 C. 166 D. 285 E 324
答案是E
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这题完全不知道如何入手~~~
3.What is the rate, in cubi feet per minute, at which water is flowing into a certain rectangular tank?
1) The height of the water in the tank is increasing at the rate of 2 feet per minute.
2)The capacity of the tank is 216 cubiec feet.
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答案E
不会做~~
4.Is the positive integer n equal to the square of an integer?
1) For every prime number p, if p is a divsor of n, then so is p²
2）根号n（不会打这个符号）is an integer.
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答案B
请各位帮忙，不甚感激~~~ |
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发表于 2012-2-22 22:55:56
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