gwd-29-35

Q35: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.

                                     1990       1910

heavy rainfall ?2,+∞)            n.a

moderate rainfall ?1,2]          <

light rainfall ?0,1]                   <

no rainfall=0                           n.a

total rainfall                    T₁₉₉₀=1.2T₁₉₁₀

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

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

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

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

4. 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

5. the average amount of rainfall per month was lower in 1990 than in 1910

答案A,我觉得A中lower应改成higher才对

Not necessary. Even if the number of days with hevay rainfallin 1990  was smaller, but the degree of fall was a lot larger, it is still possible for answer A to be valid.

If they changed the word lower to higher, it would be so obvious.

B.C.E的确都有错误，但是A这个选项可以使好几种可能，the number of days with heavy rainfall 可以是lower,higher,even the same，因为程度可以不一样，这个题出题点到底是什么？

这么说来d也可以成立了，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，因为the number of days with moderate rainfall 不等于the total number of inches of rain that fell on days with moderate rainfall ，也可以是天数1990年的比1910年的少，但是1990年下moderate rainfall 的程度比1910的大很多，不是也可以成立么？

D is not right because the number of days was fewer with moderate rainfall in 1990.  Even if the number of days was only one day less, with the range of 1 - 2 inches, it is impossible for the total number of inches of rain that fell on days with moderate rainfall in 1990 to be more than twice what it had been in 1910. Hence, D is impossible. 

 You can pick any number of days and do the calculation youself.

just as you said: the degree of fall was a lot larger, it is still possible for answer D to be valid.

 moderate rain:              1990     1910

 number of days:               1         n>1  

每天下雨程度:               24小时    1小时

the total number of inches:24*1    n*1

24*1 could > or < n*1

so the answer could be twice or triple or even more

days mean hours.

oremping

ment that days don't mean hours

cournot MM, d是不可能成立的。注意moderate rainfall是少于2 inches,但又多于 1 inch. 設x是1990年某一天moderate rainfall的量。y是1910年的一天moderate rainfall的量。x < 2y.也就是說1990年一天moderate rainfall的降雨量是不能超過1910年一天的2倍的。1990年moderate rainfall的日子又少﹐所以總量是不會多過2倍的。

這題只能是A。遇到這種題在考試中只能算倒霉。在一分多鐘的時間裡很容易錯。

谢谢楼上，现在搞懂了