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# Which of the following most logically completes the

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Which of the following most logically completes the [#permalink]

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13 Oct 2009, 10:49
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Official Guide for GMAT Verbal Review, 2nd Edition

Practice Question
Question No.: 37
Page: 130
Difficulty:

Which of the following most logically completes the argument?
Although the pesticide TDX has been widely used by fruit growers since the early 1960’s, a regulation in force since 1960 has prohibited sale of fruit on which any TDX residue can be detected. That regulation is about to be replaced by one that allows sale of fruit on which trace amounts of TDX residue are detected. In fact, however, the change will not allow more TDX on fruit than was allowed in the 1960’s, because ______.

A. pre-1970 techniques for detecting TDX residue could detect it only when it was present on fruit in more than the trace amounts allowed by the new regulations
B. many more people today than in the 1960’s habitually purchase and eat fruit without making an effort to clean residues off the fruit
C. people today do not individually consume any more pieces of fruit, on average, than did the people in the 1960’s
D. at least a small fraction of the fruit sold each year since the early 1960’s has had on it greater levels of TDX than the regulation allows
E. the presence of TDX on fruit in greater than trace amounts has not been shown to cause any harm even to children who eat large amounts of fruit
[Reveal] Spoiler: OA

Last edited by Narenn on 17 Oct 2013, 02:10, edited 3 times in total.
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13 Oct 2009, 12:11
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If the previous method to detect TDX was not accurate enough to detect it unless the level was say > 1%, then fruits with TDX qty of <=1% would have been sold anyway. If the new regulation allows up to 1% residue and if the new measurement techniques are accurate, then you will screen out fruits >1%, which is the same as it was in the 1960's.

Thats my reasoning ..
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13 Oct 2009, 12:19
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Down to A and D - D seems like the trick answer as it refers only to a fraction of the fruit

Will go with A
Not allow more TDX than before because the fruit with the trace amounts of TDX was being sold anyway.
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13 Oct 2009, 18:57
A looks the best.

However, the only problem with A is: Premise says that 'any' TDX residue was not allowed and A says that there was some TDX which went undetected. On a second thought, it is possible to have both these facts true by having the reasoning in A, that 'any (undetected) TDX residue was not allowed'

Would go with A, OA?
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Re: Which of the following most logically completes the [#permalink]

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21 Jan 2012, 02:40
B, C, D --> Irrelevant
E --> Weakens the argument
A is the only that supports.
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Re: Which of the following most logically completes the [#permalink]

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21 Jan 2012, 02:55
confused between A and D, but A is more relevant. so my reason is A
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Re: Which of the following most logically completes the [#permalink]

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26 Aug 2013, 22:20
My analysis : TDX used prio to 1960 , regulation banned any fruit on which TDX residue could be found .

New regulation replaces the old one saying some levels are permissible to be found on frutis .

New regulation will not all more TDX on fruits than earlier .... because TDX in small amounts is not dangerous compared to large amounts ?

However what i pre thought was incorrect answer in A ? Can you explain why ?
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Re: Which of the following most logically completes the [#permalink]

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28 Aug 2013, 19:02
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Expert's post
shelrod007 wrote:
My analysis : TDX used prio to 1960 , regulation banned any fruit on which TDX residue could be found .

New regulation replaces the old one saying some levels are permissible to be found on frutis .

New regulation will not all more TDX on fruits than earlier .... because TDX in small amounts is not dangerous compared to large amounts ?

However what i pre thought was incorrect answer in A ? Can you explain why ?

Hi Shelrod,

It would be much better if you can share a bit more analysis. It would help you understand better because the more you write, the clear your thought process becomes.

Coming back to the question, the highlighted part in your analysis is incorrect. We are not really concerned whether some amount of TDX is dangerous or not. This concern might be behind the introduction of the new law. However, we are not concerned with this.

We are only concerned that the new regulation will not allow more TDX on fruits than earlier. So, if new regulations allowed 5 units of TDX on fruits, then earlier regulation must also have allowed this much TDX.

However, we are given that earlier laws did not allow any TDX, then how come the conclusion hold? The conclusion can hold only if in the earlier law, law enforcement agencies were not able to detect 5 units of TDX. IF they could not detect it, how would they stop it?

This is what option A says.

Does it help?

Thanks,
Chiranjeev
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Re: Which of the following most logically completes the [#permalink]

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06 Feb 2014, 07:14
egmat wrote:
shelrod007 wrote:
My analysis : TDX used prio to 1960 , regulation banned any fruit on which TDX residue could be found .

New regulation replaces the old one saying some levels are permissible to be found on frutis .

New regulation will not all more TDX on fruits than earlier .... because TDX in small amounts is not dangerous compared to large amounts ?

However what i pre thought was incorrect answer in A ? Can you explain why ?

Hi Shelrod,

It would be much better if you can share a bit more analysis. It would help you understand better because the more you write, the clear your thought process becomes.

Coming back to the question, the highlighted part in your analysis is incorrect. We are not really concerned whether some amount of TDX is dangerous or not. This concern might be behind the introduction of the new law. However, we are not concerned with this.

We are only concerned that the new regulation will not allow more TDX on fruits than earlier. So, if new regulations allowed 5 units of TDX on fruits, then earlier regulation must also have allowed this much TDX.

However, we are given that earlier laws did not allow any TDX, then how come the conclusion hold? The conclusion can hold only if in the earlier law, law enforcement agencies were not able to detect 5 units of TDX. IF they could not detect it, how would they stop it?

This is what option A says.

Does it help?

Thanks,
Chiranjeev

It is really a super explanation with example. I tried to understand it many times but by reading official answer I couldn't understand it. Now after getting e-gmat explanation it has become easier. Would you please give some more questions of similar category in which I have to use same type of logic? Or when will I use the similar logic? Please explain.
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Re: Which of the following most logically completes the [#permalink]

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17 Nov 2014, 20:39
IMO A. Why ? if law allowed 3% TDX but the technology at that time could not detect TDX level below 5%, that means fruits with TDX between 3% to 5% were available in the market even when law didn't allow it.Due to this reason TDX was banned. Now we have the technology to accurately measure TDX level, so we brought back the old law of 3%.
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Re: Which of the following most logically completes the [#permalink]

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22 Dec 2015, 23:19
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Re: Which of the following most logically completes the [#permalink]

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02 Jul 2016, 08:19
abhi758 wrote:
Official Guide for GMAT Verbal Review, 2nd Edition

Practice Question
Question No.: 37
Page: 130
Difficulty:

Which of the following most logically completes the argument?
Although the pesticide TDX has been widely used by fruit growers since the early 1960’s, a regulation in force since 1960 has prohibited sale of fruit on which any TDX residue can be detected. That regulation is about to be replaced by one that allows sale of fruit on which trace amounts of TDX residue are detected. In fact, however, the change will not allow more TDX on fruit than was allowed in the 1960’s, because ______.

A. pre-1970 techniques for detecting TDX residue could detect it only when it was present on fruit in more than the trace amounts allowed by the new regulations
B. many more people today than in the 1960’s habitually purchase and eat fruit without making an effort to clean residues off the fruit
C. people today do not individually consume any more pieces of fruit, on average, than did the people in the 1960’s
D. at least a small fraction of the fruit sold each year since the early 1960’s has had on it greater levels of TDX than the regulation allows
E. the presence of TDX on fruit in greater than trace amounts has not been shown to cause any harm even to children who eat large amounts of fruit

A - Correct, if the techniques in pre 1970 could only tell food containing TDX by detecting the trace amount of TDX in food. Then essentially, any amount of TDX quoted in the law = trace amount of TDX detected by techniques in post 1970
B - Out of scope, we are not talking about consumers' purchasing habit
C - Out of scope, same as B
D - Opposite, if there is always a small amount of TDX in fruit since early 1960, the change in the regulation will allow more TDX on the fruit as now the TDX that can be contained by fruit is allowed at higher level
E - Out of scope, we are not talking about the effect of TDX on children's health
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Re: Which of the following most logically completes the [#permalink]

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02 Jul 2016, 18:49
straight A.

all other choices are useless.

A says the method could only detect TDX when it was more than trace amounts.
now technology has changed and observing TDX in trace is allowed .
In the last point the argument says qty sold remains same.

So only technological advances seem the obvious change.
Re: Which of the following most logically completes the   [#permalink] 02 Jul 2016, 18:49
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