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# In 1986, the city of Los Diablos had 20 days on which air

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Re: Los Diablos [#permalink]

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29 Jul 2010, 09:17
2
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ImJun wrote:
dont look too much into it, it's D trust me

A lot of people vote for D, I am as well. Source is 1000 series of CR questions.
This is badly constructed CR question, because a lot of people stuck on B/D answer choice. Here is a lot to assume either in B or D.

Here is the comment from a canadian istructor who scored 800.

"Who cares?
This is a garbage 1000cr question. You may as well have some random person design a question, and then feel bad because you can't choose between two answers. Practicing on these questions can HURT you more than it can help you.
rce be
People think more questions, more practice, better off. But if the kind of questions you are working on the are badly designed then a reason for why a right answer is right or why a wrong answer is wrong may not even be applicable on real GMAT questions. You might take away learnings that are bad information on the real test!"
(source beatthegmat.com)
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Re: Los Diablos [#permalink]

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08 Sep 2010, 00:01
B is the right answer because accuracy doesnt affect the smog allert days whereas all other options specify the reason for smog alert days.

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Re: Los Diablos [#permalink]

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10 Mar 2011, 08:46
shalu wrote:
In D SINCE THE MAYOR ACCEPTED DONATION,... SO HE EXEMPTED THOSE LOCAL INDUSTRIES FROM AIR P[OLLUTION CONTROL MEASURES .,,THAT MEANS NOW POLLUTION CREATED BY THOSE INDUSTRIES IS NOT TAKEN INTO ACCOUNT WHILE CALCULATING AIR POLLUTION LEVELS.

that gives us a reason for why pollution levels decreased .......

in that case only B sounds better.

I agree with this and that was the reason why I crossed out D. I only got B through POE and spent A LOT of time on this 2:34
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Re: Los Diablos [#permalink]

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10 Mar 2011, 10:18
tough one.....can any one provide more info about why B is correct?

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Re: Los Diablos [#permalink]

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10 Mar 2011, 20:50
I recall this question and

The OA is B apparently, because even though the gas spectometer was invented, it doesn't mean it was used.

But I'm still sticking with D!

I think in these questions we are suppose to accept the given answers as true because these are second family questions (Resolve the paradox-least). So, I think B can't be answer as it can explain the paradox (Old meter was giving wrong reading and when it was replaced with new meter then it started giving correct reading). So, I think answer is D. What is the source of the question.

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Re: Los Diablos [#permalink]

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10 Mar 2011, 20:57
sonnco wrote:
shalu wrote:
In D SINCE THE MAYOR ACCEPTED DONATION,... SO HE EXEMPTED THOSE LOCAL INDUSTRIES FROM AIR P[OLLUTION CONTROL MEASURES .,,THAT MEANS NOW POLLUTION CREATED BY THOSE INDUSTRIES IS NOT TAKEN INTO ACCOUNT WHILE CALCULATING AIR POLLUTION LEVELS.

that gives us a reason for why pollution levels decreased .......

in that case only B sounds better.

I agree with this and that was the reason why I crossed out D. I only got B through POE and spent A LOT of time on this 2:34

I don't agree with this because meter don't use to calculate air pollution with name of industry attached to it. So, how it is possible to not take into account the amount of air pollution produced while calculating? I think, it can be interpreted as- those industries will not be panalised or they are free to proudce more pollution. I will still go with D.

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Re: Los Diablos [#permalink]

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10 Mar 2011, 21:02
Pkit wrote:
ImJun wrote:
dont look too much into it, it's D trust me

A lot of people vote for D, I am as well. Source is 1000 series of CR questions.
This is badly constructed CR question, because a lot of people stuck on B/D answer choice. Here is a lot to assume either in B or D.

Here is the comment from a canadian istructor who scored 800.

"Who cares?
This is a garbage 1000cr question. You may as well have some random person design a question, and then feel bad because you can't choose between two answers. Practicing on these questions can HURT you more than it can help you.
rce be
People think more questions, more practice, better off. But if the kind of questions you are working on the are badly designed then a reason for why a right answer is right or why a wrong answer is wrong may not even be applicable on real GMAT questions. You might take away learnings that are bad information on the real test!"
(source beatthegmat.com)

May I know who is the maker of these 1000series? In sentence correction also I have come across so many mistakes in their question. Now in CR also!!! Who has produced these shits to waste the time???? It's better to master 100 questions of OG then solving these 1000 questions, which will waste your time and weaken your confidence.

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Re: Los Diablos [#permalink]

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10 Mar 2011, 22:08
1986 20
1987 31 ----> new law
1988 39
1989 16

IMO B.
I was stuck between A and B actually.

Answer choice D -- Actually explains why there was a surge in cases in 1988. Because some industries were not being controlled by the law due to bribes.

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Re: Los Diablos [#permalink]

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11 Mar 2011, 16:08
While I think it's quite a poor question, it appears some people have misunderstood the implications of answer choice D. In 1988, it was found that the mayor had exempted some industries from air pollution controls. If that's the case, those companies were exempt in a period of time *leading up to 1988*. If those companies were, after the discovery of the bribes, then required to comply with air pollution controls, that would help to explain the decrease in pollution in 1989.
Answer D does not, as some people have suggested above, give reason to think pollution ought to have increased after 1988.

I suppose B is the best answer here, but the question isn't worthy of study.
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Re: Los Diablos [#permalink]

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20 May 2011, 19:37
Minheequang wrote:
In 1986, the city of Los Diablos had 20 days on which air pollution reached unhealthful amounts and a smog alert was put into effect. In early 1987, new air pollution control measures were enacted, but the city had smog alerts on 31 days that year and on 39 days the following year. In 1989, however, the number of smog alerts in Los Diablos dropped to sixteen. The main air pollutants in Los Diablos are ozone and carbon monoxide, and since 1986 the levels of both have been monitored by gas spectrography.

Which of the following statements, assuming that each is true, would be LEAST helpful in [highlight]explaining the air pollution levels in Los Diablos between 1986 and 1989[/highlight]?

(A) The 1987 air pollution control measures enacted in Los Diablos were put into effect in November of 1988.
(B) In December of 1988 a new and far more accurate gas spectrometer was invented.
(C) In February of 1989, the Pollution Control Board of Los Diablos revised the scale used to determine the amount of air pollution considered unhealthful.
(D) In 1988 the mayor of Los Diablos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures.
(E) Excess ozone and carbon monoxide require a minimum of two years to break down naturally in the atmosphere above a given area.

The best explanation I found on internet on this question seems to be at the below link..
http://www.beatthegmat.com/the-city-of- ... html#94170

This explanation convinced me properly.
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Re: In 1986, the city of Los Diablos had 20 days on which air [#permalink]

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03 Jan 2012, 23:13
Very interesting. The problem I have with CR's is maintaining absolute concentration. I tend to get ten right then two wrong in a row. I need to build some stamina since misinterpreting one word can make the difference between right and wrong.

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Re: In 1986, the city of Los Diablos had 20 days on which air [#permalink]

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04 Jan 2012, 01:22
isn't D totally out of the context, it has to be B.

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Re: In 1986, the city of Los Diablos had 20 days on which air [#permalink]

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14 Mar 2012, 07:03
I will pick C, because what level of pollutants is considered unhealthy in totally irrelevant to the variations og gases ?
Choice B is relevant because an accurate spectrometer may prove that any of the prior pollutant levels are not accurate (maybe more or less), and hence conclusions drawn on inaccuarate data are not reliable.
Choice D is relevant because any increase in the pollutant levels might have been resulted from companies exempted by the mayor from control measures.

Also, could you please indicate the source of the question?

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Re: In 1986, the city of Los Diablos had 20 days on which air [#permalink]

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14 Mar 2012, 23:57
B is the best choice

source as indicated in above posts: 1000 CR
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Re: In 1986, the city of Los Diablos had 20 days on which air [#permalink]

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25 Apr 2012, 08:02
Minheequang wrote:
In 1986, the city of Los Diablos had 20 days on which air pollution reached unhealthful amounts and a smog alert was put into effect. In early 1987, new air pollution control measures were enacted, but the city had smog alerts on 31 days that year and on 39 days the following year. In 1989, however, the number of smog alerts in Los Diablos dropped to sixteen. The main air pollutants in Los Diablos are ozone and carbon monoxide, and since 1986 the levels of both have been monitored by gas spectrography.

Which of the following statements, assuming that each is true, would be LEAST helpful in explaining the air pollution levels in Los Diablos between 1986 and 1989?

(A) The 1987 air pollution control measures enacted in Los Diablos were put into effect in November of 1988.
(B) In December of 1988 a new and far more accurate gas spectrometer was invented.
(C) In February of 1989, the Pollution Control Board of Los Diablos revised the scale used to determine the amount of air pollution considered unhealthful.
(D) In 1988 the mayor of Los Diablos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures.
(E) Excess ozone and carbon monoxide require a minimum of two years to break down naturally in the atmosphere above a given area.

was very much confused with D and B....and still is
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Re: In 1986, the city of Los Diablos had 20 days on which air [#permalink]

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27 Apr 2012, 18:54
I choose D as well but was wondering if the broad scope of the time line in D gives B an edge.

Because he could have received a large donation in December, and then enact the bill in the next year. While the invention of a product does not mean that it was ever implemented, period.
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Re: In 1986, the city of Los Diablos had 20 days on which air [#permalink]

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28 Apr 2012, 04:27
CR 1000 is not good for practice...
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In 1986, the city of Los Diablos had 20 days on which air [#permalink]

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21 Aug 2012, 11:44
In 1986, the city of Los Diablos had 20 days on which air pollution reached unhealthful amounts and a smog alert was put into effect. In early 1987, new air pollution control measures were enacted, but the city had smog alerts on 31 days that year and on 39 days the following year. In 1989, however, the number of smog alerts in Los Diablos dropped to sixteen. The main air pollutants in Los Diablos are ozone and carbon monoxide, and since 1986 the levels of both have been monitored by gas spectrography.
Which of the following statements, assuming that each is true, would be LEAST helpful in explaining the air pollution levels in Los Diablos between 1986 and 1989?
(A) The 1987 air pollution control measures enacted in Los Diablos were put into effect in November of 1988.
(B) In December of 1988 a new and far more accurate gas spectrometer was invented.
(C) In February of 1989, the Pollution Control Board of Los Diablos revised the scale used to determine the amount of air pollution considered unhealthful.
(D) In 1988 the mayor of Los Diablos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures.
(E) Excess ozone and carbon monoxide require a minimum of two years to break down naturally in the atmosphere above a given area.
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Re: expert help needed [#permalink]

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21 Aug 2012, 12:39
siddharthasingh wrote:
In 1986, the city of Los Diablos had 20 days on which air pollution reached unhealthful amounts and a smog alert was put into effect. In early 1987, new air pollution control measures were enacted, but the city had smog alerts on 31 days that year and on 39 days the following year. In 1989, however, the number of smog alerts in Los Diablos dropped to sixteen. The main air pollutants in Los Diablos are ozone and carbon monoxide, and since 1986 the levels of both have been monitored by gas spectrography.
Which of the following statements, assuming that each is true, would be LEAST helpful in explaining the air pollution levels in Los Diablos between 1986 and 1989?
(A) The 1987 air pollution control measures enacted in Los Diablos were put into effect in November of 1988.
(B) In December of 1988 a new and far more accurate gas spectrometer was invented.
(C) In February of 1989, the Pollution Control Board of Los Diablos revised the scale used to determine the amount of air pollution considered unhealthful.
(D) In 1988 the mayor of Los Diablos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures.
(E) Excess ozone and carbon monoxide require a minimum of two years to break down naturally in the atmosphere above a given area.

1) Picture what's going on in this question through visualization in your head.

The # of days for "unhealthy" pollution levels rose from 20 days, to 31, 39, then dropped to 16 in the last year.

2) Something must explain why the numbers rose then fell. We know there was some control measures enacted in 1987 (the second year). But we then see an increase then a decrease 2 years later. Why?

(A) Helps explain - if they were not put into effect until end of 1988, we wouldn't see results until 1989 (the last year)

(B) Does not explain - the idea of a new gas spectrometer being invented is not linked to the counting of unhealthy days NOR is it linked to any increase then decrease in # of unhealthy days. Inventing an instrument has no effect on data - unless there's a specific link - the closest possible link is that all the data was bogus before and only the last year was accurate because a more accurate instrument was used and captured a far lower figure. But since the drop is so big, this possibility is extremely unlikely.

(C) Helps Explain - By revising the scale, what is considered harmful enough to count as an "unhealthy" day will drastically affect the numbers. What may have been 30 days under the old scale, could suddenly drop down to 16. So this could help explain (if implemented in the last year) why that last year figure is so low

(D) Helps Explain - 1988 levels were really high - might have been because the mayor accepted donations and he let industries pollute more that year

(E) Helps Explain - well if it takes 2 years in atmosphere to see the results, that's prob why we still had 2 bad years (tho mb doesn't explain the increase). Then in the last year it drops.

Hope that helps!

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Re: expert help needed [#permalink]

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21 Aug 2012, 13:53
gmatpill wrote:
siddharthasingh wrote:
In 1986, the city of Los Diablos had 20 days on which air pollution reached unhealthful amounts and a smog alert was put into effect. In early 1987, new air pollution control measures were enacted, but the city had smog alerts on 31 days that year and on 39 days the following year. In 1989, however, the number of smog alerts in Los Diablos dropped to sixteen. The main air pollutants in Los Diablos are ozone and carbon monoxide, and since 1986 the levels of both have been monitored by gas spectrography.
Which of the following statements, assuming that each is true, would be LEAST helpful in explaining the air pollution levels in Los Diablos between 1986 and 1989?
(A) The 1987 air pollution control measures enacted in Los Diablos were put into effect in November of 1988.
(B) In December of 1988 a new and far more accurate gas spectrometer was invented.
(C) In February of 1989, the Pollution Control Board of Los Diablos revised the scale used to determine the amount of air pollution considered unhealthful.
(D) In 1988 the mayor of Los Diablos was found to have accepted large campaign donations from local industries and to have exempted those same industries from air pollution control measures.
(E) Excess ozone and carbon monoxide require a minimum of two years to break down naturally in the atmosphere above a given area.

1) Picture what's going on in this question through visualization in your head.

The # of days for "unhealthy" pollution levels rose from 20 days, to 31, 39, then dropped to 16 in the last year.

2) Something must explain why the numbers rose then fell. We know there was some control measures enacted in 1987 (the second year). But we then see an increase then a decrease 2 years later. Why?

(A) Helps explain - if they were not put into effect until end of 1988, we wouldn't see results until 1989 (the last year)

(B) Does not explain - the idea of a new gas spectrometer being invented is not linked to the counting of unhealthy days NOR is it linked to any increase then decrease in # of unhealthy days. Inventing an instrument has no effect on data - unless there's a specific link - the closest possible link is that all the data was bogus before and only the last year was accurate because a more accurate instrument was used and captured a far lower figure. But since the drop is so big, this possibility is extremely unlikely.

(C) Helps Explain - By revising the scale, what is considered harmful enough to count as an "unhealthy" day will drastically affect the numbers. What may have been 30 days under the old scale, could suddenly drop down to 16. So this could help explain (if implemented in the last year) why that last year figure is so low

(D) Helps Explain - 1988 levels were really high - might have been because the mayor accepted donations and he let industries pollute more that year

(E) Helps Explain - well if it takes 2 years in atmosphere to see the results, that's prob why we still had 2 bad years (tho mb doesn't explain the increase). Then in the last year it drops.

Hope that helps!

How did you know that these local industries, which were exempted by the mayor, cause pollution.
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Re: expert help needed   [#permalink] 21 Aug 2012, 13:53

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# In 1986, the city of Los Diablos had 20 days on which air

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