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

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23 Jun 2010, 07:33

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D is not possible because it contradicts the prompt.

The prompt says "moderate rainfall (more than one inch, but no more than two inches)".

D says that the total number of incheas with moderate rainfall was more than twice what it had been. Since moderate rainfall, as defined in the prompt, is more than one but less than two, it isn't possible for this answer to work.

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

I actually think this is a great question. It highlights the logic that the GMAT is looking for, and of course the trickery they're known for. They also often put verbal understanding in quant questions and math understanding in verbal questions. This is such a question. If the total rainfall was higher in 1990 than 1910, you figure there were more rainiy days in 1990, but that doesn't have to be true. All the rain could have fallen on one day (at the logical extreme) and then had 364 days of clear skies. If you understand that this is possible, then you realize that A is possible. There were 5 days of 10+ inch torrential rain in 1990, and 15 days of 2 inch downpour in 1910. More days in 1910, but more rain in 1990.

The other answer choices can be eliminated by the question stem (B, C and E) or by basic math (D). Days with moderate rainfall are between 1 and 2 inches, so at a minimum value 1.00. If they double, they will no longer count as moderate rainfall days and instead move up to heavy. The biggest difference you can have was 1.00 in 1910 and 1.99 in 1990. This will never get to double the rainfall. A is the only possibility, although it is counter-intuitive. This type of reasoning is helpful in math as well, particularly in stats when you realize that average is the most misleading characteristic of them all.

If the number of days of light, moderate & heavy rainfall are all lower in 1990, then how could the total rainfall be more?

Still not convinced with A

If in the first week it rains for one day and in the second week it rains for two days, can you conclude that it rained more in the second week? What if the one day of the first week was a full day of heavy downpour and the two days of the second week just saw light 5 minute showers each? Number of days is just one aspect. The amount of rainfall that fell on each day is another.
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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
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Re: In Patton City, days are categorized as having heavy [#permalink]

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11 Nov 2014, 00:03

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correct answer should be (E):

(E) the average amount of rainfall per month was lower in 1990 than in 1910

average amount of rainfall per month is likely to be lower in 1990 than in 1910, as only heavy rain seems to be the reason for the total rainfall being more than in 1910

--> there were some month in 1990 with a lot of heavy rainfall

VeritasPrepKarishma: I can perfectly understand the logic you gave for option B. But I don't understand how C is incorrect.!! If rainfall was 20% higher in 1990 and given that LR+MR (1990)<LR+MR(1910) then I am left with only one assumption that HR has to be higher in 1990.!! I do understand your explanation for option A. But I need more clarity.

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

The days with some rainfall, but no more than two inches are LR days and MR days. So (C) says LR Days + MR Days (1990) > LR Days + MR Days (1910)

But from our analysis of the argument, we already know that LR Days + MR Days (1990) < LR Days + MR Days (1910)

Hence (C) is not possible.

As for (A), it is based on the logic that more days of rainfall does not mean more rainfall (inches). The intensity of rainfall can be higher over fewer days and hence fewer days could result in more rainfall.
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Re: In Patton City, days are categorized as having heavy [#permalink]

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14 Jun 2008, 13:34

how is 'c' possible

The stem says there are fewer days of light and moderate rain in 1990 option C directly contradicts what is written in the stem cos it essentially says that 1990 got more number of light and moderate rain days , which is false

IMO the best choice is D ....

lets say 1990 got fewer no of days for moderate + light rain but on days when it got it , the rains were closest to 2 inches whereas in 1910 u got more number of such days , but its possible each day u got it closer to the lower end of the slab which is around one

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

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23 Jun 2010, 05:51

Wow..real sneaky!! Missed it completely.
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Re: In Patton City, days are categorized as having heavy [#permalink]

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14 Jul 2010, 22:40

Well A is right - and unless by some divine intervention - because picking A is anything but intuitive - one were to just "get" it somehow - eliminating the other choices is a royal pain

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