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标题: JJ491,496,379,381,Friday 就要考了,请大家帮忙 [打印本页]

作者: icecream_mba    时间: 2006-10-25 20:43
标题: JJ491,496,379,381,Friday 就要考了,请大家帮忙

491. grocery store sells some mixture of 1.5 kg cashew nuts and other kind of nuts 6kg.  for $ 1.5 of every 0.25kg.  And then it tells you that the sales is more than 50% of the total cost. The cost of cashew nuts equals to the other kind of nuts.. So what is the cost of cashew per kg..


其实好像是以前的JJ,不过以前的JJ好像不完整。挺简单的。(6+1.5)*1.5/0.25/150%/2/1.5    (数字不一定完全对,大家了解一个思路吧)

 

Don’t understand the 思路

 

496.还有开始一道很奇怪的题,算STANDARD DIVEATION。好像是说一个COMMITEE,一个有6member,3j, 3k, 还有一个committee,4 people, 1j, 3k. DS,问关于第二个COMMITTEE标差的。
                    
1

                
好像是说第一个COMMITTEE的标差为0
2
J=K  
KEY D

                
两个算出来都可以。

讨论D,由条件1J=K,所以第二个的SD=0

379.10个数的和是28,而且这10个数的RANGE2,10个数中是3的个数可能为:
                

0,5,9

A:5ONLY

B:9ONLY

C:忘记了,反正是两个数组合

 

讨论应该为整数吧?如果可以为小数则除了9都可以,range2,则最大-最小=228/10=2.8平均值,如果为9,则3*=27 剩下那个是1range不为2,如果为5,则28-15=1313不满足,如果为0,也不满足

381. 1.5公斤的XX6公斤的巴西豆掺乎在一起,XX的单价是巴西豆的4倍,卖得价钱是1.5大洋/250,最后掺乎物卖得的钱比总进价多50%,问XX进价多少

讨论101.5/0.25=6 $/kg, so 原价=6/1.5=4 $/kg,  

x*1.5+x*6/4=4(1.5+6), x=10

 


作者: flyinglamb    时间: 2006-10-25 22:46

557. If N is a common multiple of 75, 98, and 140, which of the following must be true?

I. N is divisible by 9

II. N is divisible by 49

III. N is greater than 14000

讨论III

75=3*5*598=2*7*7140=2*2*5*7

N至少为2*2*3*5*5*7*7=14700

第二个答案应该也对啊。


作者: flyinglamb    时间: 2006-10-25 22:52
 

491. grocery store sells some mixture of 1.5 kg cashew nuts and other kind of nuts 6kg.  for $ 1.5 of every 0.25kg.  And then it tells you that the sales is more than 50% of the total cost. The cost of cashew nuts equals to the other kind of nuts.. So what is the cost of cashew per kg..


其实好像是以前的JJ,不过以前的JJ好像不完整。挺简单的。(6+1.5)*1.5/0.25/150%/2/1.5    (数字不一定完全对,大家了解一个思路吧)

Don’t understand the 思路

题目大意:一个商店卖1。5和6公斤的坚果混合物,所有总重量就是7。5公斤

每0。25公斤1。5快,那就是一公斤6快。

 sale price is 50% more means (1+50%) cost.

cost of cashew nuts equals to the other kind of nuts。

所以,总售价7。5*6处以1。5就是总成本,因为两个坚果成本一样,除一二,就是腰豆坚果的成本,除一它的公斤数就是单价。


作者: icecream_mba    时间: 2006-10-26 08:39
thx alot




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