GWD-29-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.

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

为何答案选A?

hr*hrdays+mr*mrdays+lr*lrdays=total

根据题意可知，1990,hrdays少，mrdays少

如果total1990=1.2total1910=〉 total1990〉total1910

带入，hr*hr1990days+mr*1990mrdays〈hr*hr1910days+mr*1910mrdays

所以，lr*lr1990days〉lr*lr1910days

好像没有答案~~~~

所以，lr1990days〉lr1910days