In Patton City, days are categorized as having heavy : GMAT Critical Reasoning (CR)
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# In Patton City, days are categorized as having heavy

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

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12 Nov 2008, 10:34
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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
If you have any questions
New!
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Re: CR: GMAT Set 29 -35 [#permalink]

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12 Nov 2008, 11:01
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.

IMO D.
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Re: CR: GMAT Set 29 -35 [#permalink]

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12 Nov 2008, 11:04
Looks tricky. I would go for D as well for this one. Whats the QA ?
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Re: CR: GMAT Set 29 -35 [#permalink]

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12 Nov 2008, 11:22
same as others D..
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Re: CR: GMAT Set 29 -35 [#permalink]

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12 Nov 2008, 13:09
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]

E!
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Re: CR: GMAT Set 29 -35 [#permalink]

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12 Nov 2008, 13:46
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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 1028 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
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Re: CR: GMAT Set 29 -35 [#permalink]

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12 Nov 2008, 19:08
v good one.
A for me.
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Re: CR: GMAT Set 29 -35 [#permalink]

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12 Nov 2008, 21:06
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
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Re: CR: GMAT Set 29 -35 [#permalink]

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13 Nov 2008, 07:02
Guys, OA is A! It would be good to know what you think about D and why it is wrong. I couldn't choose between these two.
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Re: CR: GMAT Set 29 -35 [#permalink]

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13 Nov 2008, 17:40
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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

Do I make sense? or was I vague?
Re: CR: GMAT Set 29 -35   [#permalink] 13 Nov 2008, 17:40
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