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Gwd-18-29

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楼主
发表于 2005-11-23 11:45:00 | 只看该作者

Gwd-18-29


参考答案为B,不知道怎么回事, 就是算不出来


A sum of money was divided between John and Anne such that the ratio of John’s share to Anne’s share was 5 to 3.  If John’s share exceeded of the sum of money by $50, what was Anne’s share?



A.     $180


B.     $270


C.     $340


D.     $450


E.   $720

沙发
 楼主| 发表于 2005-11-23 11:49:00 | 只看该作者

这道也不懂啊



Q23:


The toll for crossing a certain bridge is $0.75 each crossing.  Drivers who frequently use the bridge may instead purchase a sticker each month for $13.00 and then pay only $0.30 each crossing during that month.  If a particular driver will cross the bridge twice on each of x days next month and will not cross the bridge on any other day, what is the least value of x for which this driver can save money by using the sticker?



A.     14


B.     15


C.     16


D.     28


E.      29

板凳
发表于 2005-11-23 12:10:00 | 只看该作者

我这老革命的笨办法如下:


已知:1.J+A=S,2.J/A=5/3(即J=5A/3)    3.J=5S/9 +50


1+2+3    得到5A/3=5/9(5A/3+A)+50   得A=270  答案为B


仅供参考


地板
发表于 2005-11-23 12:15:00 | 只看该作者
以下是引用jinghezhao在2005-11-23 12:10:00的发言:

我这老革命的笨办法如下:


已知:1.J+A=S,2.J/A=5/3(即J=5A/3)    3.J=5S/9 +50


1+2+3    得到5A/3=5/9(5A/3+A)+50   得A=270  答案为B


仅供参考



3式怎么得出来的。

5#
发表于 2005-11-23 12:17:00 | 只看该作者

If John’s share exceeded ATH extrusionok="f" gradientshapeok="t" connecttype="rect">ATH>of the sum of money by $50, what was Anne’s share?


这句话啥意思,我怎么看不懂呢。可能么?

6#
发表于 2005-11-23 12:24:00 | 只看该作者

q23是选B么?


假设X天刚好cover那个13块钱回来,那么根据已知可得等式


13+2X*0.3=2X*0.75,解出X=14+4/9,所以X应该为15天。

7#
发表于 2005-11-23 12:25:00 | 只看该作者

首先,我看的GWD17M原题.该MM将原题中的有关你指出的3式的数据遗漏.请查原题补漏后再做为宜.该MM在另一贴问的GWD18M-33也是漏数据.请明查.

8#
发表于 2005-11-23 12:34:00 | 只看该作者

谢谢提醒


lz mm太粗心了吧

9#
 楼主| 发表于 2005-11-25 12:40:00 | 只看该作者

晕菜,脑子一下子别不过来了,多谢楼上两位,但愿我考试时不要这样啊

10#
发表于 2010-10-4 16:25:56 | 只看该作者
Q29:
A sum of money was divided between John and Anne such that the ratio of John’s share to Anne’s share was 5 to 3.  If John’s share exceeded  of the sum of money by $50, what was Anne’s share?

$180
$270
$340
$450
$720
J/A=5/3 --->1
and J=5/9(A+J) + 50 ---> 2
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