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标题: 几道陈向东上的数学小题,快考试了,希望可以有高人给予帮助~ [打印本页]

作者: guoyun622    时间: 2009-8-11 12:38
标题: 几道陈向东上的数学小题,快考试了,希望可以有高人给予帮助~

data sufficient
1. a home owner must pick between paint A, which costs $6.00 per liter, and paint B, which costs $4.50 per liter. Paint B takes one-third longer to apply than paint A. If the home owner must pay the cost of labor at the rate of $36 per hour, which of the two paints will be cheaper to apply?
(1) the ratio of the area covered by one liter of paint A to the area covered by paint B is 4:3
(2) paint A will require 40 liters of paint and 100 hours of labor

2. in a certain law firm there are five senior partners and all senior partners receive bonuses greater than those of the junior partner. Does senior partner Johnson receive the largest bonus of the lawyers at the firm?
(1) Johnson receives a bonus greater than twice the average bonus for all the senior partners.
(2) all partners receive some bonus, and Mr. Johnson receives five times the average given to all the partners.

3.During July, a mail order retailer received 3300 order for amounts less than $100, and 1100 orders for amounts of at least $100. What was the average size of an order in July?
(1) the gross sales from the orders less than $100 equaled the gross sales from the orders greater than $100.
(2) the orders for less than $100 account for a total of $134000in gross sales.

答案是EBC..很诡异><


[此贴子已经被作者于2009/8/11 15:55:30编辑过]

作者: vivian_zmszz    时间: 2009-8-11 12:55

1.我的想法是设面积S,A用时t

(1)4:3的比率,设为4a和3a

则A总花费为(S/4a)*6+36t ,B总花费为(S/3a)*4.5+48t

化简以后,A为3S/2a+36t,B为3S/2a+48t,所以A的花费少些,(1)可

(2)不知需多少liter的B,无法求解不可比,(2)不可

所以我觉得选A,请问答案是多少,你应该先贴上来。


作者: guoyun622    时间: 2009-8-11 15:55
以下是引用vivian_zmszz在2009/8/11 12:55:00的发言:

1.我的想法是设面积S,A用时t

(1)4:3的比率,设为4a和3a

则A总花费为(S/4a)*6+36t ,B总花费为(S/3a)*4.5+48t

化简以后,A为3S/2a+36t,B为3S/2a+48t,所以A的花费少些,(1)可

(2)不知需多少liter的B,无法求解不可比,(2)不可

所以我觉得选A,请问答案是多少,你应该先贴上来。

不好意思啊..贴得急忘写答案了...这题竟然选的是E....我也不明白...


作者: guoyun622    时间: 2009-8-11 17:03

顶...请大家给予帮助....~~


作者: guoyun622    时间: 2009-8-11 18:03
再顶~
作者: guoyun622    时间: 2009-8-11 19:22
一小时顶一次...相信一定会有人来..
作者: 银小小    时间: 2009-8-11 21:54

1.更正一下,觉得答案错了,应该选A

2.(2)这句话怎么感觉有点矛盾,意思是不是别的Partner都没有bonus了。。。

3.size应该也是指钱的意思,两个部分都是$134000,然后除以总数4400就可以了。


[此贴子已经被作者于2009/8/12 0:28:09编辑过]

作者: vivian_zmszz    时间: 2009-8-11 23:53

对哦,傻掉了,谢谢指正


作者: vivian_zmszz    时间: 2009-8-12 00:06
等一下,1 liter的A cover 4a的面积,则总共的S面积需S/4a个liter的A,同样总需S/3a个B,哪不对了,请解释下~~
作者: 银小小    时间: 2009-8-12 00:27

不好意思啊,我看错了,同意你的,这题应该选A

谢谢你啊


[此贴子已经被作者于2009/8/12 0:28:32编辑过]

作者: vivian_zmszz    时间: 2009-8-12 06:36
嗯,差点误导了呵呵~好紧张啊这月底就考了,还没换题库
作者: guoyun622    时间: 2009-8-12 15:02
以下是引用银小小在2009/8/11 21:54:00的发言:

1.更正一下,觉得答案错了,应该选A

2.(2)这句话怎么感觉有点矛盾,意思是不是别的Partner都没有bonus了。。。

3.size应该也是指钱的意思,两个部分都是$134000,然后除以总数4400就可以了。


谢谢```我原来一直没想到S是固定的..汗..

请问第2题是不是应该选E啊...


作者: guoyun622    时间: 2009-8-12 15:03
以下是引用vivian_zmszz在2009/8/12 6:36:00的发言:
嗯,差点误导了呵呵~好紧张啊这月底就考了,还没换题库

谢谢MM...祝大家都考试成功~~~


作者: CHENCHENKYLE    时间: 2020-3-14 12:39
第一题关键在于第一个选项的理解,指的是1liter的A和B的比率,但是B是几liter不得而知,所以无从下手
                      第二个选项只知道A的不知道B的也是无从下手




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