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# In Patton City, days are categorized as having heavy

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Manager
Joined: 14 May 2008
Posts: 61
In Patton City, days are categorized as having heavy [#permalink]

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14 Jun 2008, 12:55
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95% (hard)

Question Stats:

24% (01:49) correct 76% (02:16) wrong based on 4171 sessions

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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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03 Dec 2010, 12:23
56
12
raghavs wrote:
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

The question is asking for an option that is possible but not necessarily true.
Stimulus tells us:
HR > 2
MR 1 to 2
LR 0 to 1
No Rain 0

LR Days (1990) < LR Days (1910)
MR Days (1990) < MR Days (1910)
Yet, Total rainfall 1990 > Total rainfall 1910

A. the number of days with heavy rainfall was lower in 1990 than in 1910
This is possible. Even if HR Days (1990) < HR Days (1910), still 1990 could have had higher total rainfall. Think if in 1990, HR days were fewer, but on each one of those days, it rained 50 inches whereas in 1910, HR Days were more but on each one of those days, it rained only 3 inches, then total rainfall in 1990 could be higher than that of 1910. This is the answer.

B. the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910.
Not possible because it is given that
LR Days (1990) < LR Days (1910)
MR Days (1990) < MR Days (1910)
So LR Days (1990) + MR Days (1990) < LR Days (1910) + MR Days (1910)

C. the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910
Not possible because of the reason given in (B).

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 Possible. On a moderate rainfall day, amount of rainfall is more than 1 but less than 2. If number of MR days in 1990 is less than the number of MR days in 1910, no amount of rain can make the total rainfall more than twice.

E. the average amount of rainfall per month was lower in 1990 than in 1910
Not Possible.
Total rain (1990) > Total rain (1910)
Average rain per month = (Total rain)/12
Total rain (1990)/12 > Total rain (1910)/12
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Re: In Patton City, days are categorized as having heavy [#permalink]

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14 Jun 2008, 19:34
16
3
I think A is a possible answer as it says:

"the number of days with heavy rainfall was lower in 1990 than in 1910" however the amount of rain in 1990 can be more on these days than in 1910. Since heavy rainfall is defined as anything greater than 2 inches.
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Joined: 08 Jun 2010
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Re: In Patton City, days are categorized as having heavy [#permalink]

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23 Jun 2010, 05:48
7
4
I will go with A.

(A) the number of days with heavy rainfall was lower in 1990 than in 1910
>>>> The author says lower light and moderate rainfall, YET only 20% more rainfall in 1990. This means there was some other factor that led to lower total rainfall. Above argument solves this !

(B) the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910
>>> There is no such rainfall listed in the question. So rejected.

(C) the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910
>>> There is no such rainfall listed.

(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
>>> If 1910 received 1.5inch of rainfall, then 1990 would have received 3inch rainfall. But 2+ inch means heavy rainfall. So this is incorrect too.

(E) the average amount of rainfall per month was lower in 1990 than in 1910
>> This will mean that 1990 had less rainfall than 1910.
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Re: In Patton City, days are categorized as having heavy [#permalink]

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23 Jun 2010, 07:45
9
First I chose D, then after reviewing I see how A is the correct answer.

From the first statement we know

1990 has
fewer light rainfall days
fewer moderate rainfall days
20% more total rainfall

I think the question's design is for you to search for an explanation for the difference. We all know the questions:

"Which one of the following would best explain the seeming contradiction" or some wording similar......So this is the way we approach this question, that leads us to find D as a possible explanation.

But they questions is which could possibly be true.

You could read choice A as follows:

It is possible that in Patton City the number of days with heavy rainfall was lower in 1990 than in 1910.

Yes it is possible, why not. For example....

In 1990 we could have 10 days with heavy rainfall, and in 1910 we could have 11 days with heavy rainfall.

This example reminds us that when we see which could be true.....we should keep a very open mind.

I tried out some sample data for D.
1910 --> 100 moderate days x 1.0000000000000000000000000000000001 inches each day = c. 100 inches on moderate days
1990 --> 99 moderate days x 2 inches each day = 198 inches

198 inches is not greater than double 100 inches
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Re: In Patton City, days are categorized as having heavy [#permalink]

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23 Jun 2010, 21:18
3
Thats how I figured out A -

Firstly, why it can not be C,D

C - the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910. This contradicts with the stem that in 1990 we have had fewer days of moderate and light rainfall. So ruled out..

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. Lets assume in 1910 we have had three days of moderate rainfall and in 1990 the best scenario we could have two. Assume, worst case scenario we received 1 Unit of rainfall in all days in 1900 thus total 3 units and in 1990 we received 2 units (the max we could recieve for moderate) each day. Thus, it comes to total of 4 Units. But , 4<3*2. This contradicts the statement and this is the most favourable case that we could assume for 1990.

Why its A:
A) the number of days with heavy rainfall was lower in 1990 than in 1910
The number can be lower (assume just a difference of one day) , but the intensityof rainfall received 1990 could be substantially greater than in 1990 to offset this difference.

Hope it helps..

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

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14 Sep 2012, 17:18
5
Fun question

Here is why (A) the number of days with heavy rainfall was lower in 1990 than in 1910 is the answer:

On first glance this answer seems the opposite of what we are going for. Surely, Patton City had more days with heavy rain in 1990 than in 1910, otherwise how could one possibly account for the 20% increase in rain from 1910 to 1990. But here is the thing: even if Patton City had fewer days with 2+ inches of rain in 1990 than in 1910, if those days were marked by heavily deluges, then 1990 would have more inches of rain than 1910. Let me illustrate: Let's say that in 1990 Patton City had five days with 2+ inches of rain (Day 1: 4 inches, Day 2: 5 inches, Day 3: 6 inches, Day 4: 5 inches, Day 5: 3 inches). In 1910 Patton City had six rainy days with 2+ inches or rain (Day 1 : 2.5 inches, Day 2: 2.3 inches, Day 3, 2.4 inches...etc.). You can see that, despite fewer 2+ inches days, 1990 has far more inches of rainfall from 2+ inches days than 1910 does.
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Re: In Patton City, days are categorized as having heavy [#permalink]

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18 Dec 2012, 03:27
9
3
arjun206 wrote:
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
E. the average amount of rainfall per month was lower in 1990 than in 1910

I cant seem to understand why the answer is what it is.. i have the reasoning available with me will post this soon..

Coming to choice A, Can the number of days of heavy rainfall be lower in 1990 than in 1910? It is possible because even if the number of days of heavy rainfall was lower, the rainfall could have been lot more heavier on those days making the total rainfall for the year more. Let us keep this choice.

Choice B and C are not possible because they directly contradict the information given that there are fewer number of days of both light and moderate rainfall in 1990 than in 1910.

Choice D contradicts the definition of moderate rainfall as moderate rainfall on any two days by definition has to vary by less than twice.

Choice E is also not possible because if total rainfall for a year was higher than that of another year, then the average rainfall per month for that year also has to be higher than that of the other year.

So Choice A should be the answer.
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Re: In Patton City, days are categorized as having heavy [#permalink]

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02 Jul 2013, 09:38
2
1
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.

Hope this helps!
-Ron
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Re: In Patton City, days are categorized as having heavy [#permalink]

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06 Jul 2013, 09:41
sakiii wrote:
NO option is logically correct... but, i will go with D

I really hope no one believes the GMAT would ever give you a question that isn't logically correct. I guess it is possible to see a question on these forums that isn't a valid GMAT question, but this one is perfectly logical, although it probably isn't intuitive.

Let's do a simple example using one week in 1910 and one in 1990:

Rainfall Week 1 1910
M T W R F S S
0 10 0 0 15 0 10

Average rainfall: 35/7 = 5
Number of heavy days: 3

Rainfall week 1 1990
M T W R F S S
20 0 0 0 22 0 0

Average rainfall: 42/7 = 6
Number of heavy days: 2

Answer A makes perfect sense in this situation. More rain in 1990, but less heavy days. I.E. Each heavy day was really heavy. No other choice works logically.

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

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21 Aug 2013, 21:18
quantum wrote:
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

really tuff one

Responding to a pm:

I think Ron has explained it really well above. I would suggest you to read his explanation. As requested, I am putting down the explanation in my words too.

The first and only thing to note here is that "fewer days of rain" does not mean "less rainfall". Say, last year it rained for 10 days. This year it rained for 5 days. Still it is possible that it rained much more this year than last year. Perhaps in those 5 days, the rain received was very very heavy and it more than made up for the 5 day shortfall.

It is possible that 1990 had fewer days in each category but overall had more rainfall. Think of a case which looks like this:

1910
Light rainfall - 10 days - A trace on each of the 10 days
Moderate rainfall - 10 days - 1.1 inch on each of the 10 days
Heavy rainfall - 10 days - 2.1 inch on each of the 10 days

1990
Light rainfall - 8 days - 1 inch on each of the 10 days
Moderate rainfall - 8 days - 2 inch on each of the 10 days
Heavy rainfall - 8 days - 4 inch on each of the 10 days

Would you agree that 1990 had more rainfall than 1910 even though the number of days of rainfall in each category is lower?

So (A) is certainly possible and is the correct answer.

(B) the number of days with some rainfall, but no more than two inches, was the same in 1990 as in 1910
The no of days of light/moderate rainfall in 1990 is less, not equal hence this is not possible.

(C) the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910
The no of days of light/moderate rainfall in 1990 is less, not higher in 1990 hence this is not possible.

(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
Moderate rainfall is more than 1 inch but less than or equal to 2 inches. The least rainfall you can get on a moderate rainfall day is 1.00001 inch (i.e. a little more than 1 inch). The maximum you can get is 2 inches. So on any given moderate rainfall day, you cannot have twice the rainfall of any other given moderate rainfall day. Since 1990 had fewer days of moderate rainfall, it cannot have more than twice the rainfall obtained in 1910 on moderate rainfall days.

(E) the average amount of rainfall per month was lower in 1990 than in 1910
If the average rainfall is lower in 1990, the total rainfall will also be lower in 1990 (since both years had 12 months!). This is not possible since we know that total rainfall in 1990 is higher.
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Re: In Patton City, days are categorized as having heavy [#permalink]

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23 Aug 2013, 00:26
sshivanis04 wrote:
Hi Karishma

I understand the logic for A however there could be another meaning to the statements :

Question Steam: 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.

Question stem means that days of moderate+light rainfall for 1900 < moderate+light rainfall for 1910 however the total rainfall for 1900 > total rainfall for 1910.

This could mean that heavy rainfall for 1900 > heavy rainfall for 1910 for the total rainfall for 1900 to be greater than 1910 and this is what choice C states -
(C) the number of days with some rainfall, but no more than two inches, was higher in 1990 than in 1910.
I interpreted some rainfall = heavy rainfall +moderate+light.

Request you to pl clarify.

Thx

I think you need to reconsider again - focus on two things: Days of rainfall & Amount of rainfall

When they say 20% more rainfall, they mean AMOUNT of rainfall is 20% more. It is not directly related to the 'DAYS of rainfall'. Keep this in mind and then check out the explanation above.

Fewer days of moderate and light rainfall doesn't have any direct implications for the amount of rainfall received on moderate and light rainfall days.
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Re: In Patton City, days are categorized as having heavy [#permalink]

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11 Dec 2013, 20:44
A4G wrote:
quantum wrote:
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

really tuff one

Can someone explain with more clarity. Even after reading the explanations I fail to understand why is D not the correct answer

Given: In 1990 there were fewer days of moderate rainfall than in 1910

1 < Moderate rainfall <= 2 inches
Say,
1910 - 20 days
1990 - 19 days

Can this be correct
(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
Is it possible that inches of rain on these 19 days of 1990 was more than twice of the inches of rain on these 20 days of 1920?
Let's look at the most favorable case - 20 days of 1910 had as little as possible rain on these moderate rain days and 19 days of 1990 had as much as possible.

1910 - 20 days - each day, rainfall was slightly more than 1 inch so total rainfall is slightly more than 20 inches
1990 - 19 days - each day, rainfall was 2 inches (max possible) and so total rainfall is 38 inches

If 1990 had fewer days of moderate rainfall, it cannot have more than twice the rainfall of 1910.
For each day of 1990, you will need to have more than twice the rainfall of each day of 1910 but that is not possible because min rainfall on a moderate day is more than 1 and max is 2 (which is less than twice of 'more than 1')
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Re: In Patton City, days are categorized as having heavy [#permalink]

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18 Jun 2014, 20:17
1
Shalabh18 wrote:
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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Re: In Patton City, days are categorized as having heavy [#permalink]

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11 Nov 2014, 18:42
3
souvik101990 wrote:
New Project - Reviving the hardest questions on GMAT Club. Kudos for every reply with an explanation in the first 24 hours!

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 chose [A] the number of days with heavy rainfall was lower in 1990 than in 1910

Explanation and elimination of other choices:

We are only given ranges for rainfall on a described day. Therefore a single day of heavy rain in 1990 (characterized as H > 2 inches) could have more total inches that a larger number of heavy rainfall days in 1910. If, for example, 1910 had 10 days of 2.1 inches per day then it could be possible for 1990 to have 1 day of 30 inches. This could satisfy the evidence provided. Therefore I could not eliminate A.

B. "Some rainfall" but no more than 2 inches would mean that "light" and "moderate days" fit into this definition. We are given that the number of days of moderate rainfall and light rainfall in 1990 are lower than in 1910, so this seems to contractdict the evidence provided. If both ranges were less than 1910 then how could it be possible that the totals are the same? Eliminated.

C. Same logic applied to B but now we are told that 1990 could be greater than 1910. Again, I elimiated as this doesn't fit with the evidence provided.

D. Total number of inches that fell on moderate days in 1990 was more than twice what it had been in 1910. We are given that there were fewere days with moderate rainfall in 1990 than 1910. So, the only way that twice the number of inches to fall on those fewer days would be if the allowable range (to be considered a moderate rainfall day) was higher than the range we were given. We were given that a moderate day was "more than one inch, but no more than 2", which I believe is repsented by Moderate is greater than one but less than or equal to two. That range is less than one inch by definition. Therefore, it wouldn't it be impossible to have fewer days of rain but twice the number of inches if, to be considered a "moderate" day it MUST fall with that range? This didn't seem right so I eliminated this as well.

Example: If there were 5 days of moderate rain in 1910 and 4 days of moderate rain in 1990 (satisfying the evidence given), and if each day in 1910 only rained just over 1 inche per day (lower part of range), or a little more than 5 inches,...then even if it rained exactly 2 inches per day during the 4 moderate days in 1990 we would still only have 8 inches. You cannot satisfy this choice with the evidence given.

E. Average amount of rainfall per month was lower in 1990 than in 1910. I assume that average monthly rainfall could be simply calculated as Total Rainfall/12 months. We are given that the 1990 total rainfall was 20% higher in 1990 than 1910, and since both have the same denominator (12 months), wouldn't it be impossible to have a higher total but lower average amount of rainfall per month? I eliminated this also.

Not sure if my logic is correct. Took me 4 minutes to solve.
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Re: In Patton City, days are categorized as having heavy [#permalink]

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15 May 2015, 16:47
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2
B and C are impossible, because we know that in 1910 there were more days with light rainfall than in 1990, and in 1910 there were more days with moderate rainfall than in 1990. So light+moderate in 1910 must be greater than light+moderate in 1990.

For D, suppose we had k days in 1910 with moderate rainfall, and z days in 1990 with moderate rainfall. The question tells us that k > z. The most rainfall you can have per moderate day is 2 inches, so in 1990, the most rainfall you could have in total on moderate days is 2z inches. The least rain you could have on a moderate day is 1 inch, so in 1910, the least total rainfall you could have on all moderate days is k inches.

We've made the moderate rain in 1990 as big as possible, and the moderate rain in 1910 as small as possible, so if it is possible for D to be be true, it will certainly be true in this case. But if it's true that 2z more than twice as big as k, then it would be true that 2z > 2k, or that z > k, and we know that is false. So D is impossible.

For E, if the total annual rainfall in 1910 was T, the question tells us the total was 1.2T (20% greater) in 1990. So the average monthly rainfall in 1910 was T/12, and the average in 1990 was 1.2T/12, which is larger than T/12. So E is impossible.

A, however, can easily be true. I'll ignore the 20% part of the question, because it's not important - the question is whether we could have more rain in 1990 even if there are fewer days with heavy rain, with moderate rain, and with light rain than in 1910. And suppose in 1990 there were 364 days with no rain, 0 days with light rain, 0 days with moderate rain, and just 1 day with heavy rain, but on that 1 day there was 500,000,000,000 inches of rain. And suppose in 1910 you had 65 days with no rain, 100 days with 0.5 inches, 100 days with 1.5 inches, and 100 days with 2.5 inches. Then we have far more rain overall in 1990, even though we have fewer days with heavy, moderate and light rainfall - fewer days in every category. Answer A can still be true as long as the heavy rainfall days in 1990 were much heavier than in 1910 (there are other ways it can be true, but this is probably the easiest one to see).
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Re: In Patton City, days are categorized as having heavy [#permalink]

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09 Nov 2015, 01:11
1
narendran1990 wrote:
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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30 May 2018, 07:01
very good question.
should use a bit of math.
though i got it wrong i was able to understand the logic behund the right answer.
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Re: In Patton City, days are categorized as having heavy [#permalink]

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20 Jun 2018, 11:11
cstew wrote:
souvik101990 wrote:
New Project - Reviving the hardest questions on GMAT Club. Kudos for every reply with an explanation in the first 24 hours!

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 chose [A] the number of days with heavy rainfall was lower in 1990 than in 1910

Explanation and elimination of other choices:

We are only given ranges for rainfall on a described day. Therefore a single day of heavy rain in 1990 (characterized as H > 2 inches) could have more total inches that a larger number of heavy rainfall days in 1910. If, for example, 1910 had 10 days of 2.1 inches per day then it could be possible for 1990 to have 1 day of 30 inches. This could satisfy the evidence provided. Therefore I could not eliminate A.

B. "Some rainfall" but no more than 2 inches would mean that "light" and "moderate days" fit into this definition. We are given that the number of days of moderate rainfall and light rainfall in 1990 are lower than in 1910, so this seems to contractdict the evidence provided. If both ranges were less than 1910 then how could it be possible that the totals are the same? Eliminated.

C. Same logic applied to B but now we are told that 1990 could be greater than 1910. Again, I elimiated as this doesn't fit with the evidence provided.

D. Total number of inches that fell on moderate days in 1990 was more than twice what it had been in 1910. We are given that there were fewere days with moderate rainfall in 1990 than 1910. So, the only way that twice the number of inches to fall on those fewer days would be if the allowable range (to be considered a moderate rainfall day) was higher than the range we were given. We were given that a moderate day was "more than one inch, but no more than 2", which I believe is repsented by Moderate is greater than one but less than or equal to two. That range is less than one inch by definition. Therefore, it wouldn't it be impossible to have fewer days of rain but twice the number of inches if, to be considered a "moderate" day it MUST fall with that range? This didn't seem right so I eliminated this as well.

Example: If there were 5 days of moderate rain in 1910 and 4 days of moderate rain in 1990 (satisfying the evidence given), and if each day in 1910 only rained just over 1 inche per day (lower part of range), or a little more than 5 inches,...then even if it rained exactly 2 inches per day during the 4 moderate days in 1990 we would still only have 8 inches. You cannot satisfy this choice with the evidence given.

E. Average amount of rainfall per month was lower in 1990 than in 1910. I assume that average monthly rainfall could be simply calculated as Total Rainfall/12 months. We are given that the 1990 total rainfall was 20% higher in 1990 than 1910, and since both have the same denominator (12 months), wouldn't it be impossible to have a higher total but lower average amount of rainfall per month? I eliminated this also.

Not sure if my logic is correct. Took me 4 minutes to solve.

Yes Your logic is correct. Only A is possible answer. Other options are never possible.
Re: In Patton City, days are categorized as having heavy   [#permalink] 20 Jun 2018, 11:11
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