一道没想通的题求指点

穆汐寒

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
这题没想通，1990年light rainfall和moderate rainfall 的天数都比1910年少，但总雨量比1910年高20%，那要是heavy rainfall也少了，多出来的20%是怎么做到的？

lisiberry

看了一眼，不会，晚上再来看看。

RRZZR

每天下雨的量 和 下雨的天数是不一样 的。

举个极端的例子：

1990年只有一天heavy rainfall，下了100 inches；1910年heavy rainfall下了两天，每天是3 inches。其它的认为1990年下雨天为0，而1910年随便填点数字。

最后你仍然可以满足1990 total rainfall高于1910年20%

穆汐寒

RRZZR 发表于 2017-3-11 00:38
每天下雨的量 和 下雨的天数是不一样 的。

举个极端的例子：

明白了，是没看仔细，谢谢！

lisiberry

你明白了就好，非常感谢你挑出这道题。看了2遍才明白。
再次觉得逻辑其实挺考阅读能力和理解能力的。
想想精明的领导最强的能力应该就是快速地可以明白一个资料想要表达的意思，然后才是做决定的部分。因此认为逻辑好的人综合能力就高，差不多就等于能力高了。
-------------------------------------------------------------------------------------还有单独看这道题，难点就在于它的不确定性。没法确定大雨的天数。

1910年的中雨和小雨的日子比较多。→排除B，C，D
1990年大雨下的量比较多。→排除E
问哪个选项比较有可能性。

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