请教GWD逻辑题

melody远行 · 发表于 2012-4-22 14:13:24

In Patton City, days are categorized as having heavy rainfall (more than two inches), moderate rainfall (more than one inch, but no more than two inches), light rainfall (at least a trace, but no more than one inch), or no rainfall.In 1990, there were fewer days with light rainfall than in 1910 and fewer with moderate rainfall, yet total rainfall for the year was 20 percent higher in 1990 than in 1910.

If the statements above are true, then it is also possible that in Patton City

A.the number of days with heavy rainfall was lower in 1990 than in 1910

B.the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910

C.the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910

D.the total number of inches of rain that fell on days with moderate rainfall in 1990 was more than twice what it had been in 1910

E.the average amount of rainfall per month was lower in 1990 than in 1910
答案是A，可是我怎么都想不通，有同学能给解释解释吗？感谢！

melody远行 · 发表于 2012-4-22 15:42:24

有会的同学能教教吗？纠结了很久！

amiroven · 发表于 2012-4-23 19:13:50

In Patton City, days are categorized as having heavy rainfall (more than two inches), moderate rainfall (more than one inch, but no more than two inches), light rainfall (at least a trace, but no more than one inch), or no rainfall.In 1990, there were fewer days with light rainfall than in 1910 and fewer with moderate rainfall, yet total rainfall for the year was 20 percent higher in 1990 than in 1910.

If the statements above are true, then it is also possible that in Patton City

A.the number of days with heavy rainfall was lower in 1990 than in 1910

题目的意思是，日子分为大雨、中雨、小雨、没雨。
1990和1910比，
小雨的日子少
中雨的日子少
但是捏
总共的雨量却比1910高

问：推论?
其实,,,这是一个解释题
你得先理解了 “为啥小雨中雨少，但是总雨量还高” 这个paradox

A的意思是，大雨的日子1990比1910多

即，打个比方，1910下大雨只有1天，下小雨的有2天，中雨2天，总=2+2×1.5+2×0.5=6
由于1990狂下雨的日子特别多，比如说，350天都在下大雨，那么小雨1天，中雨1天，不用算（总=350×2+1.5×1+0.5×1=702），也知道比1910的总雨量大啦><

melody远行 · 发表于 2012-4-24 08:35:35

感谢！可我觉得A的意思是1910大雨的日子比1990的多？

amiroven · 发表于 2012-4-24 15:59:53

啊啊！！！扫瑞！！是我看错了55555555555555

melody远行 · 发表于 2012-4-24 16:17:28

那你知道为什么答案选A吗？打扰了！

Allenisland · 发表于 2012-4-24 22:22:27

这题有点bt的，看moderate light什么的绕晕了...我们看题目要选的是possible的选项，也就是说排除其他不可能的选项就可以了
其实BCE三个选项很好排除，但是A和D两选项就要细想了
A的话说下大雨的天数1990比1910少，但是如果1990每天都下的很大，超过1910的很多的话（注意题目中说的heavy rain是只要大于两英寸就可以了），最后总的雨量还是能够大于1910年的雨量的
D选项说1990中雨天的总雨量比1910年中雨天的两倍还多，这个的话要取极值了，假设1990年的中雨天每天都是2inch，1910年每天的中雨天都是1inch，那么就算两年中雨天天数相等，1990年的总雨量也不可能会比1910年的两倍还多，何况1990年的中雨天总天数还比1910年的中雨天总天数要少

本贴相关题目 TN-19-CR-38 (GKPC)

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