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><

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...

顶...请大家给予帮助....~~

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。

对哦，傻掉了，谢谢指正

不好意思啊，我看错了，同意你的，这题应该选A

谢谢你啊