国际顶尖MBA申请交流平台--TOPWAY MBA

标题: 请教DS [打印本页]

作者: joywzy 时间: 2003-1-16 19:48 标题: 请教DS

21. If □ represents a digit in the 7-digit number 3, 62□, 215, what is the value of □?
(1) The sum of the 7 digits is equal to 4 times an integer.
(2) The missing digit is different from any of the other digits in the number.
Ans: C
我选E
(1)=>3+6+2+2+1+5+x=4K => 19+X=4K
(2)=>X=4,7,8,9，0
将（2）代入（1），得不出X=？所以我选E
我错在哪？

18. Bowls X and Y each contained exactly 2 jelly beans, each of which was either red or black. One of the jelly beans in bowl X was exchanged with one of the jelly beans in bowl Y. After the exchange, were both of the jelly beans in bowl X black?
(1) Before the exchange, bowl X contained 2 black jelly beans.
(2) After the exchange, bowl Y contained 1 jelly bean of each color.
Ans: E
我选D
each of which was either red or black.=>X，Y均是一红豆一黑豆？

22. Last Tuesday a trucker paid $155.76, including 10 percent state and federal taxes, for diesel fuel. What was the price per gallon for the fuel if the taxes are excluded?
(1) The trucker paid $0.118 per gallon in state and federal taxes on the fuel last Tuesday.
(2) The trucker purchased 120 gallons of the fuel last Tuesday.
Ans: D

再次请教做DS有什么好办法吗？我都是出错。有什么好办法吗？谢谢！

作者: 卧室春竹 时间: 2003-1-16 20:37

1 4*7=19+9

[此贴子已经被作者于2003-1-16 20:37:02编辑过]

作者: 卧室春竹 时间: 2003-1-16 20:40

2 看看第一个条件就知道可以是都是黑的或者ALL白的...

[此贴子已经被作者于2003-1-16 20:40:07编辑过]

作者: 卧室春竹 时间: 2003-1-16 20:45

3题条件一.. 155.76*10%/0.118= GALLON的数量

条件二知道GALLON的数量当然能知道除去税收后每加仑的价钱

唉！~ 俺DS也是老出错... 估计粗心的人都这个毛病..(高人来指导一下！）

我还是 CS 比较牛... 呵呵

作者: joywzy 时间: 2003-1-16 20:45 标题: 谢谢卧室春竹！

21是我粗心，明明思路都对了，却得不出正确答案。

请问另外两题的思路。谢谢！

作者: joywzy 时间: 2003-1-16 22:10 标题: 能否详细讲解2，3题解题思路

不好意思，实在有点笨。

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