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In Patton City, days are categorized as having heavy [#permalink]

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12 Nov 2008, 11:34

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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

This question is good example of shift in focus. Question starts with rainfall days depending on amount of rain and ends with total rainfall. In my words it is huge shift.

Suppose we had 11 days of 1.1 inches rain in 1910 and 10 days of 1.9 inches rain in 1990. Although 1910 had more moderate rainy days, 1990 have more quantity of rain (This is the catch here). Not necessarily that number of heavy rains days has to be more in 1990.

A. the number of days with heavy rainfall was lower in 1990 than in 1910 Not necessarily true as explained above.

B. the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910 Not true directly opposite to what is stated in the passage.

C. the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910 Not true directly opposite to what is stated in the passage.

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 Seems Correct.

E. the average amount of rainfall per month was lower in 1990 than in 1910 No way to predict per month data.

A. the number of days with heavy rainfall was lower in 1990 than in 1910 [Heavy rainfall is not mentioned] B. the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910 [Argument says fewer than – eliminate it] C. the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910 [As per argument it is fewer] 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 [not per argument] E. the average amount of rainfall per month was lower in 1990 than in 1910 [Hold on]

eager to hear the OA. My initial choice was C, but then decided to draw out on paper and came up with A. yes, and here's why

Attachment:

diag C.JPG [ 14.22 KiB | Viewed 1167 times ]

as you can see from above, there are quite a few unknowns. Let's work each answer choice

A. It says AB > AD...hmmm maybe possible. Let's hold on to this choice

B. says # of days with some rainfall(but <= 2) is same in 1990 and 1910. That not possible. As we are told in the question stem that is not the case. Sum(BA + CA) > Sum(BC,CC)

C. Same argument as above. Sum(BA + CA) > Sum(BC,CC) and not less. So incorrect

D. It says BB > 2 times x BD. hmmm.. maybe possible. Hold on to this.

E. Says Avg rainfall in 1990 < Avg in 1910. Or (EB/12) > (ED/12). Impossible. That's contradictory to what question stem says. i.e. Total rainfall in 1990 is 20% more than in 1910. So incorrect.

Now we are left with a toss up between A and D. While I understand the shift in the question. I choose to go with A, because the question seems to revolve around # of days and not around volume.

I maybe wrong in the pick, but that'd be my pick on exam day
_________________

excellence is the gradual result of always striving to do better

Well, I got this one wrong (D)..Curiosity got the best of me and I went searching for the answer and found that I was in deed totally wrong by picking D. Masuhari and vsckid got it right by picking A. For those who care to spend a few minutes reading the reasoning, check this out: http://gmatclub.com/forum/p468931#p468931

O M G! I eliminated B C D E and then only saw why it can be A.

Pray that I dont get such Q's on the test.

Here is how I did this

HR: R > 2 ; MR 1<R <=2 ; LR 0<R<=1 ; NR R=0

1990 MR < 1910

1990 LR < 1910

yet

1990 TR = (1.2) 1910TR

As usual, I did not have the slightest inkling when I set out looking for answer. expect the unexpected!

B. the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910 Some Rainfall <=2 is MR + LR. If thats the case, then how can be TR greater in 1990 compared to 1910, assuming we dont know any thing else.

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

Some Rainfall <=2 is MR + LR. Contradicts the stimulus, cannot be true

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

This was a clear trap which I fell for, but got out of. The point we have to see if it had double the rain the day would no longer be counted as day with mod rainfall as MR is defined as 1<R<=2 and double of any such R would be greater than 2 and make it HR.

E. the average amount of rainfall per month was lower in 1990 than in 1910 Avg = Total /12 ; TR 1990 < TR 1910. Stimulus says other wise. Hence wrong

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

Now this is possible because there might only be 2 days in 1990 during which there was a non stop down pour that contributed to the TR and still have 1990 HR < 1910 HR