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guo573874201 · 发表于 2011-9-21 02:28:58

1. From May 1 to May 30 in the same year, the balance in a checking account increased.What was the balance in the checking account on May 30 ?
(1)If, during this period of time, the increase in the balance in the checking account had been 12 percent, then the balance in the account on May 30 would have been $504.
(2)During this period of time, the increase in the balance in the checking account was 8 percent.答案选C 为什么呢我没又看懂题为什么出来了两个增长率呢

2.Last year in a group of 30 businesses, 21 reported a net profit and 15 had investments in foreign markets.How many of the businesses did not report a net profit nor invest in foreign markets last year?
(1)Last year 12 of the 30 businesses reported a net profit and had investments in foreign markets.
(2)Last year 24 of the 30 businesses reported a net profit or invested in foreign markets, or both.答案选D 第二个条件是怎么推出来的呢？

3.If x, y, and z are consecutive even positive integers, which of the following could be equal to x + y + z ?

A.141
B.200
C.318答案选C 怎么得出的啊
D.391
E.412

HsiaoYuChen · 发表于 2011-9-21 03:53:12

3. Key point is "consecutive even" positive integers.

X+Y+Z must be even. -->B, C or E

consecutive even
-->X=Y-2, Z=Y+2
X+Y+Z=3Y
B.3Y=200, Y is not integer
C.3Y=318 Y=106
E.3Y=412 Y is not integer.

--> left out B and E, the answer is C.

HsiaoYuChen · 发表于 2011-9-21 04:02:18

1. Key word是條件一的"if"
條件1.給了一個increase的假設: 如果當月increase是12%, 當月底balance是站504.
-->我們可得知當月初的Balance
條件2則是給了真實的increase,8%
所以才能以(1)+(2)得出月底Balance.

2.
not report a net profit nor invest in foreign markets=TTL- net profit - investment + bot net profit and invest in Foreign market.=TTL- a net profit or invested in foreign markets, or both=30-24=6
畫圖會比較簡單.

guo573874201 · 发表于 2011-9-21 05:13:49

我只是纳闷第二题的第二个条件 30中的24给出了 3个可能性，所以不确定是我的理解的问题吗请问能帮我翻译一下马谢了

wellizsm · 发表于 2011-9-21 06:32:13

一共4种可能 3种相加是24 那么最后一种只能是30-24

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