The owner of a four-storey commercial building discovered : GMAT Critical Reasoning (CR)
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# The owner of a four-storey commercial building discovered

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The owner of a four-storey commercial building discovered [#permalink]

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04 Dec 2008, 12:38
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The owner of a four-storey commercial building discovered termites in the building's first and second floors and called an exterminator. THe exterminator pumped gas directly into the walls on both the first and second floors. Due to the exterminator's work, the termites on those floows were killed quickly.

Which of the following, if true, most seriously undermines the validity of the explanation for the speed with which the termites were killed?

a. The third floor had no termite infestation
b. Even though the exterminator did not pump gas into the walls of the fourth story, the termites there died as quickly as they did on the first and second stories.
c. The speed with which termites are killed increases as the concentration of exterminator's gas increases.
d. The speed with which the exterminator's gas kills termites drops off sharply as the gas dissipates throughout the building's walls.
e. The exterminator's gas pumping system works efficiently even when pumping gas into both the first and second stories of the building simultaneously.

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Re: CR: Termites and Exterminator [#permalink]

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04 Dec 2008, 14:38
hbs2012 wrote:
The owner of a four-storey commercial building discovered termites in the building's first and second floors and called an exterminator. THe exterminator pumped gas directly into the walls on both the first and second floors. Due to the exterminator's work, the termites on those floows were killed quickly.

Which of the following, if true, most seriously undermines the validity of the explanation for the speed with which the termites were killed?

a. The third floor had no termite infestation
b. Even though the exterminator did not pump gas into the walls of the fourth story, the termites there died as quickly as they did on the first and second stories.
c. The speed with which termites are killed increases as the concentration of exterminator's gas increases.
d. The speed with which the exterminator's gas kills termites drops off sharply as the gas dissipates throughout the building's walls.
e. The exterminator's gas pumping system works efficiently even when pumping gas into both the first and second stories of the building simultaneously.

[color=#008000][b]Weaken argument:

B

Argu claims that due to ext term the termites killed "quickly" on first and second

If B, is true, how come the termites on fourth floor were "quickly" killed -so it undermines

On first scan, I overlooked word "quickly " in B

Last edited by iamcste on 04 Dec 2008, 15:02, edited 1 time in total.
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Re: CR: Termites and Exterminator [#permalink]

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04 Dec 2008, 14:47
hbs2012 wrote:
The owner of a four-storey commercial building discovered termites in the building's first and second floors and called an exterminator. THe exterminator pumped gas directly into the walls on both the first and second floors. Due to the exterminator's work, the termites on those floows were killed quickly.

Which of the following, if true, most seriously undermines the validity of the explanation for the speed with which the termites were killed?

a. The third floor had no termite infestation
b. Even though the exterminator did not pump gas into the walls of the fourth story, the termites there died as quickly as they did on the first and second stories.
c. The speed with which termites are killed increases as the concentration of exterminator's gas increases.
d. The speed with which the exterminator's gas kills termites drops off sharply as the gas dissipates throughout the building's walls.
e. The exterminator's gas pumping system works efficiently even when pumping gas into both the first and second stories of the building simultaneously.

B

something else must have caused the termits' fast death and floor 4 proves that
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Re: CR: Termites and Exterminator [#permalink]

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04 Dec 2008, 15:15
Agree with B...
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Re: CR: Termites and Exterminator [#permalink]

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05 Dec 2008, 11:25
B.
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Re: CR: Termites and Exterminator [#permalink]

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26 Dec 2008, 16:12
We also had the same termite extermination problem in your 2 floor building office and would like to hear more tips and answer for that. Please? We are running out of time.

I'm sorry, let me rephrase the question..

Last edited by CarolineRony on 28 Dec 2008, 09:06, edited 1 time in total.
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Re: CR: Termites and Exterminator [#permalink]

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26 Dec 2008, 22:59
CarolineRony wrote:
We also had the same termite extermination problem in your 2 floor building office and would like to hear more tips and answer for that. Please? We are running out of time.

What do you mean? Whether or not You get the reasoning ?
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Re: CR: Termites and Exterminator [#permalink]

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29 Dec 2008, 04:23
B
weakens the st.
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Re: CR: Termites and Exterminator [#permalink]

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29 Dec 2008, 19:50
(B)
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Re: CR: Termites and Exterminator [#permalink]

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29 Dec 2008, 22:59
yes B. This is the only option that provides some other potential cause of the same effect.
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Re: CR: Termites and Exterminator [#permalink]

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31 Jan 2009, 13:44
hbs2012 wrote:
The owner of a four-storey commercial building discovered termites in the building's first and second floors and called an exterminator. THe exterminator pumped gas directly into the walls on both the first and second floors. Due to the exterminator's work, the termites on those floows were killed quickly.

Which of the following, if true, most seriously undermines the validity of the explanation for the speed with which the termites were killed?

a. The third floor had no termite infestation
b. Even though the exterminator did not pump gas into the walls of the fourth story, the termites there died as quickly as they did on the first and second stories.
c. The speed with which termites are killed increases as the concentration of exterminator's gas increases.
d. The speed with which the exterminator's gas kills termites drops off sharply as the gas dissipates throughout the building's walls.
e. The exterminator's gas pumping system works efficiently even when pumping gas into both the first and second stories of the building simultaneously.

My beef with this Q

The stimulus says T were found on 1st and second floor.

Answer choice B adds that termites on 4th floor died. C mon Termites do not die magically. Do they? Some thing else caused them to die. Some thing else caused the T on 4th floor to die doesn't weaken the fact that T on 1st/2nd were killed by efficiency of E. Some thing else might have caused them to die on 4, but what is the proof that the same/similar some thing else was done on 1/2??. Only then we can say that B actually weakens the efficiency/speed of E used on 1st/2nd Do I make sense or Am I just caught in a vicious circle? IMO, If at all, B does support this. B is saying, E was not done in 4th floor. T died. So it is possible that the gas permeated into 3rd/4th floors and got the T killed.

Please point out any error in my reasoning.
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Re: CR: Termites and Exterminator [#permalink]

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31 Jan 2009, 22:36
icandy, you are thinking too much

The question stem wants you to undermine the validity of the explanation for the speed with which termites were killed. The explanation : only because of pumping of gas the termites died as quickly as they did

So, any answer choice that proves the reasoning in 'the explanation' is not the only way the termites die as quickly, would undermine the validity explanation and solve the question

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Re: CR: Termites and Exterminator [#permalink]

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01 Feb 2009, 00:14
[quote="hbs2012"]The owner of a four-storey commercial building discovered termites in the building's first and second floors and called an exterminator.

Are we not making simple assumption of T bieng there in 4th Floor,despite of Questn clearly indicates that Owner has seen T in 2nd & 3rd Floor only.

Why are we assuming that the building is having T in fourth floor also. I think it would be D....

What u say guys??
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Re: CR: Termites and Exterminator [#permalink]

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01 Feb 2009, 09:23
Definitely B
This question is similar to one in OG11 in which the frost gets evaporated at the side panes also though no hot air blower is there.(dnt rem exact wordings)
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Re: CR: Termites and Exterminator [#permalink]

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01 Feb 2009, 10:22
To weaken ( from Gmat CR Bible )

Cause --> Effect

(Exterminator efficiency) --> Killing

If we could hint any other cause , such argument is most weakened.

B shows a possibility of another cause.
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Re: CR: Termites and Exterminator [#permalink]

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01 Feb 2009, 11:36
B is the only real candidate among the answer choices, but I agree with icandy above - it really isn't a very good answer either. Why are we to assume that the exterminator's work didn't also affect the termites on the 4th floor? It's clear from the structure of the question that we are supposed to assume that, but the assumption doesn't seem warranted to me.
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Re: CR: Termites and Exterminator [#permalink]

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01 Feb 2009, 12:58
Hi mates,

Although B seems to be the more popular, I'd go with D

My thoughts:

We have to look for a reason that undermines the validity of the explanation about why the termites died so quickly, well D related (in an inverse way) the speed at which the termites were killed and the speed at which the gas dissipated.

OA and Source?

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Re: CR: Termites and Exterminator [#permalink]

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01 Feb 2009, 21:45
D would actually srengthen the conclusion by verifying that the exterminator's worl was the result of the termites disappearing.
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Re: CR: Termites and Exterminator [#permalink]

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02 Feb 2009, 05:10
hbs2012 wrote:
The owner of a four-storey commercial building discovered termites in the building's first and second floors and called an exterminator. THe exterminator pumped gas directly into the walls on both the first and second floors. Due to the exterminator's work, the termites on those floows were killed quickly.

Which of the following, if true, most seriously undermines the validity of the explanation for the speed with which the termites were killed?

a. The third floor had no termite infestation
b. Even though the exterminator did not pump gas into the walls of the fourth story, the termites there died as quickly as they did on the first and second stories.
c. The speed with which termites are killed increases as the concentration of exterminator's gas increases.
d. The speed with which the exterminator's gas kills termites drops off sharply as the gas dissipates throughout the building's walls.
e. The exterminator's gas pumping system works efficiently even when pumping gas into both the first and second stories of the building simultaneously.

Here is my take..

Termites on the floors were killed quickly because "The exterminator pumped gas directly into the walls on both the first and second floors. "

Now to undermines the validity of the explanation for the speed with which the termites were killed... we need to prove tht speed at which the termites die is not only because of "The exterminator pumped gas directly into the walls on both the first and second floors. " but also by some other reason.

A, E - out of scope. we are not worried abt third floor infection/ The exterminator's gas pumping system works efficiently

C - talks abt the speed increase..but we are actually searching for another reason for speed other than "pumping gas directly into the walls"

D - talks abt speed drop off

B - clearly says that termites were killed in 4th floor even though the exterminator didn't pumped gas directly into the walls.

Hope it is succint.
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Re: CR: Termites and Exterminator [#permalink]

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02 Feb 2009, 12:57
selvae, why do you drop D off?

Actually, the question relates with speed...
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Re: CR: Termites and Exterminator   [#permalink] 02 Feb 2009, 12:57

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