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GMAT 请教3道数学题

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楼主
发表于 2009-1-5 17:37:00 | 只看该作者

GMAT 请教3道数学题

1.after reading 3/5 of his biogogy homework on Monday night, Bernie ready 1/3 of his reamaining homework on Tue night. What fraction of his original homework would bernie have to read on Wed night to complete his biology assignment?

a,1/15        b.2/5           c 4/15,       d 2/5        e 4/5

answer: c 4/15

2.if 1/2 of the money in a certain trust fund was invested in stocks, 1/4 in bonds, 1/5 in a mutual fund, and the remaining $10,000 in a government certificate, what was the total amount of the trust fund?

a.$10,000        b. $150,000        c.$200,000,     d. $500,000           e $2,000,000

answer is C

3.on Monday, a certain animal shelter housed 55 cats and dogs. By friday, exactly 1/5 of the cats and 1/4 of the dogs had been adopted, no new cats and dogs were brought to the shelter during this period. What is the greatest possible number of pets that could have been adopted from the animal shelter between Mon and Fri?

a.11           b 12           c 13             d 14               e 20

answer is C

我不知道是没看懂题目还是怎么,做错了, 请大家帮忙下,谢谢啦

沙发
发表于 2009-1-5 21:09:00 | 只看该作者
1. (1-3/5)*(1-1/3) = 4/15
2. 10,000/(1-1/2-1/4-1/5) = 200,000
3. 当cat数最小,dog数最大是,adopted可能得到最大的数
不过cat数等于5,10,dog数都不能被4整除,所以只有cat=15, dog=40,Max num=15*(1/5)+40*(1/4)=13
板凳
 楼主| 发表于 2009-1-5 22:00:00 | 只看该作者

感谢SPECMAN帮助

可是还是不明白: 如下

1.3/5是仅限BIOLOGY HOMEWORK, 1/3也仅限剩下的部分啊,问题是求:WED NIGHT的HOMEWORK和全部作业的比吗?

地板
发表于 2009-1-6 15:30:00 | 只看该作者
问题问的是他需要在星期三做原始作业的多少百分比以全部完成作业.
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