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In the past the country of Malvernia has relied heavily on imported

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In the past the country of Malvernia has relied heavily on imported  [#permalink]

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In the past the country of Malvernia has relied heavily on imported oil. Malvernia recently implemented a program to convert heating systems from oil to natural gas. Malvernia currently produces more natural gas each year than it uses, and oil production in Malvernian oil fields is increasing at a steady pace. If these trends in fuel production and usage continue, therefore, Malvernian reliance on foreign sources for fuel is likely to decline soon.

Which of the following would it be most useful to establish in evaluating the argument?


(A) When, if ever, will production of oil in Malvernia outstrip production of natural gas?

(B) Is Malvernia among the countries that rely most on imported oil?

(C) What proportion of Malvernia's total energy needs is met by hydroelectric, solar, and nuclear power?

(D) Is the amount of oil used each year in Malvernia for generating electricity and fuel for transportation increasing?

(E) Have any existing oil-burning heating systems in Malvernia already been converted to natural-gas-burning heating systems?


The Official Guide for GMAT Review, 13th Edition, 2012

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Question No.: CR 72
Page: 522

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Originally posted by metallicafan on 26 Oct 2010, 08:51.
Last edited by Bunuel on 18 Sep 2018, 03:06, edited 1 time in total.
Renamed the topic and edited the question.
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Re: In the past the country of Malvernia has relied heavily on imported  [#permalink]

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New post 10 May 2015, 16:47
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A "most useful to evaluate" question is typically best approached from a weaken mindset. Look to establish the conclusion and premises, decipher the gap in logic, and then think about how you would attack the gap. The correct answer will be focused on one of the gaps in logic.

Here the argument states that while Malvernia relied heavily on imported oil in the past, the company has implemented a program to convert heating systems from oil to natural gas, and the country is steadily increasing its oil production each year. From these premises the argument concludes that, if these trends continue, Malvernia is likely to experience a reduced dependency on foreign oil in the future. The primary gap in logic here is that this argument is focused on the supply of oil increasing and then one demand of the oil potentially decreasing (heating systems). However, there could be many other oil demands that increase drastically, potentially more than offsetting these factors. Answer D correctly addresses this, because if the amount of oil used for generating electricity and transportation increases greatly, Malvernia may end up depending even more on foreign oil, not less, and thus the conclusion would not hold.

Answer choice A is a pretty irrelevant comparison. Even though Malvernia currently produces more natural gas than it uses, it may just use essentially zero natural gas. Answer choice B is completely out of scope - other countries don't matter. Answer choice C is also out of scope - the argument is not discussing alternative energy sources. And answer choice E is irrelevant. Knowing whether any systems have currently been converted (may 1 has, maybe 1,000,000 have) or not doesn't affect this argument.

I hope this helps!
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Re: In the past the country of Malvernia has relied heavily on imported  [#permalink]

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New post 10 May 2015, 13:16
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In the past the country of Malvernia has relied heavily on imported oil. Malvernia recently implemented a program to convert heating systems from oil to natural gas. Malvernia currently produces more natural gas each year than it uses, and oil production in Malvernian oil fields is increasing at a steady pace. If these trends in fuel production and usage continue, therefore, Malvernian reliance on foreign sources for fuel is likely to decline soon.

Which of the following would it be most useful to establish in evaluating the argument?

(A) When, if ever, will production of oil in Malvernia outstrip production of natural gas?
(B) Is Malvernia among the countries that rely most on imported oil?
(C) What proportion of Malvernia's total energy needs is met by hydroelectric, solar, and nuclear power?
(D) Is the amount of oil used each year in Malvernia for generating electricity and fuel for transportation increasing?
(E) Have any existing oil-burning heating systems in Malvernia already been converted to natural-gas-burning heating systems?

Malvernia

Step 1: Identify the Question

In the question stem, the words useful to establish in evaluating indicate that this is an Evaluate the Argument question.

Step 2: Deconstruct the Argument

Past: M lots I oil

Recent: heating oil → gas

Now: make > gas than use

oil prod incr steady

If trends cont → M rely less on foreign fuel

The conclusion is in the form of an if-then statement: If these trends continue, then something else will happen. It’s important to note that the author’s argument is predicated on the idea that the trends will continue. Don’t fall into a trap based on the possibility that the trends will not continue; the author hasn’t concluded anything about what might happen if the trends do not continue. The author is only claiming that her conclusion is true if M continues to produce more gas each year than it uses and if oil production keeps increasing at a steady pace.

What does this argument assume? M already has to import oil, but the argument assumes that increasing oil production at a steady pace will allow the country to reduce its oil imports. What if M’s oil consumption is increasing at a much greater pace than its oil production?

Step 3: Pause and State the Goal

On Evaluate questions, the answers will be in the form of a question or a “whether x is true” statement. The correct answer will address an issue on which the argument hinges, depending on whether that statement is true: one way, the argument will be strengthened; the other way, the argument will be weakened.

Step 4: Work from Wrong to Right

(A) The argument does not provide any detail about the relative amounts of oil vs. gas production. Whether M’s oil production outstrips gas production next year or in 20 years, it is still unclear whether the country needs more oil than it produces.

(B) The argument does not compare M to other countries. It is focused solely on whether M will continue to need to import foreign fuel.

(C) If 3% of M’s total needs are currently met by these other energy sources, nothing is changed about the current oil and gas needs as stated in the argument. If 50% of M’s total needs are currently met by these other energy sources, it is still the case that current oil and gas needs are the same as in the argument.

(D) CORRECT. If M needs an increasing amount of oil every year for other uses (electricity and transportation), then it may be the case that M’s oil production is not increasing at a fast enough rate to keep pace with demand. In this case, the argument is weakened. If, on the other hand, M does not need an increasing amount of oil every year for these other needs, then it may be the case that M’s oil production is increasing at a fast enough rate to keep pace with demand, in which case the argument is strengthened.

(E) If none have already been converted, the argument is not impacted because the conclusion is claimed to happen soon; the argument does not say that the conclusion has already occurred. If 1,000 have already been converted, the argument is still not impacted, because the conclusion is still set in the future.
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Re: In the past the country of Malvernia has relied heavily on imported  [#permalink]

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New post 26 Oct 2010, 13:34
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In the past the country of Malvernia has relied heavily on imported oil. Malvernia recently implemented a program to convert heating systems from oil to natural gas. Malvernia currently produces more natural gas each year than it uses, and oil production in Malvernian oil fields is increasing at a steady pace. If these trends in fuel production and usage continue, therefore, Malvernian reliance on foreign sources for fuel is likely to decline soon.

Which of the following would it be most useful to establish in evaluating the argument?

(A) When, if ever, will production of oil in Malvernia outstrip production of natural gas? - evaluating this is irrelevant. this does not test if the replacing natural gas with oil, and with oil production increasing foreign dependency will stop.

(B) Is Malvernia among the countries that rely most on imported oil? - out of scope

(C) What proportion of Malvernia's total energy needs is met by hydroelectric, solar, and nuclear power? - again, introducing new elements. out of scope

(D) Is the amount of oil used each year in Malvernia for generating electricity and fuel for transportation
increasing? - same as C, introducing new elements. If the question was evaluating the conclusion THEN this would be the best to evaluate "indeed if reliance on foreign countries on oil will decrease"

(E) Have any existing oil-burning heating systems in Malvernia already been converted to natural-gas-burning
heating systems? - this helps to evaluate the argument as per stated in the argument "Malvernia recently implemented a program to convert heating systems from oil to natural gas - and required to evaluate the argument

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Re: In the past the country of Malvernia has relied heavily on imported  [#permalink]

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New post 05 Nov 2010, 15:41
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Hi guys,

Looks like there's some confusion on this one, so let's give it a closer look. Thabk's emphasis on the conclusion is important (and correct). When a CR question asks what would be most useful to evaluate "the argument", really it is asking you what would help evaluate the conclusion. The conclusion here is clearly marked by the keyword "therefore": "Malvernian reliance on foreign sources for fuel is likely to decline soon."

And what would help evaluate the conclusion? An answer choice that will (depending on what is established) either strengthen or weaken that conclusion. So really, you can treat this kind of question as either Strengthen or Weaken, but in my experience it's usually easiest to treat these "useful to evaluate" questions as Weaken. Think of it this way: The author's argument is missing some information (what it would be useful to establish), and therefore there is a gap between his evidence and his conclusion. The correct answer would expose that gap, just as it would in a standard Weaken question.

To the stimulus. On first reading, it seems like a pretty reasonable argument. The Malvernians have relied on imported oil in the past, but they may be able to turn that around, for two reasons:

1. They're switching from oil to natural gas, of which they have a plentiful supply.
2. Domestic oil production is increasing.

If domestic oil supply is going up and demand is going down, it seems almost inevitable that their reliance on imported oil will decrease. However, note the limited scope of the first premise: they aren't switching ALL oil usage to natural gas, only the fuel used in their heating systems. We actually don't know anything about the overall demand for oil. That is the gap in the author's reasoning. Choice D exploits this gap: if the amount of oil used for non-heating purposes (generating electricity and transportation) is increasing, then the overall demand for oil might still be increasing too fast for domestic oil production to keep pace (even though production is increasing as well).

E seems to be the most popular wrong answer choice, so let's talk about that one too. It references the heating systems mentioned in the stimulus, so it's tempting. However, remember that we need to evaluate the conclusion. Will the fact that some oil-burning systems have already been converted to natural gas affect whether Malvernian reliance on foreign sources for fuel "is likely to decline soon"? Not really. Whether the conversions have already started or not, they will happen, so in effect this answer neither adds to nor takes anything away from the argument. Now, you could get into all sorts of complicated logic to convince yourself that E is the answer -- Like, maybe because the conversions have started, that means that the all the conversions will happen faster, and maybe if the conversions happen faster it's more likely that reliance on foreign oil will decline soon... Maybe, maybe, maybe. This kind of speculative thinking is never required on the GMAT (and in fact can be disastrous). The correct answer on a Strengthen or Weaken question must DIRECTLY affect the conclusion -- not after multiple steps. Don't overthink CR answer choices!

However, as this question shows, it is extremely important to read the stimulus carefully and note the specific wording involved. Better to spend a little extra time up front to understand the stimulus rather than flounder around with the answer choices, not knowing what you're looking for. Ideally on this question you would be able to predict, in vague from, what the answer will look like before reading the answer choices. However, this isn't always possible. As long as you have a good understanding of the stimulus you should be fine.

Hope that sheds some light on this question.

Happy studying...
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Re: In the past the country of Malvernia has relied heavily on imported  [#permalink]

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New post 11 May 2015, 02:23
VeritasPrepBrandon wrote:
A "most useful to evaluate" question is typically best approached from a weaken mindset. Look to establish the conclusion and premises, decipher the gap in logic, and then think about how you would attack the gap. The correct answer will be focused on one of the gaps in logic.

Here the argument states that while Malvernia relied heavily on imported oil in the past, the company has implemented a program to convert heating systems from oil to natural gas, and the country is steadily increasing its oil production each year. From these premises the argument concludes that, if these trends continue, Malvernia is likely to experience a reduced dependency on foreign oil in the future. The primary gap in logic here is that this argument is focused on the supply of oil increasing and then one demand of the oil potentially decreasing (heating systems). However, there could be many other oil demands that increase drastically, potentially more than offsetting these factors. Answer D correctly addresses this, because if the amount of oil used for generating electricity and transportation increases greatly, Malvernia may end up depending even more on foreign oil, not less, and thus the conclusion would not hold.

Answer choice A is a pretty irrelevant comparison. Even though Malvernia currently produces more natural gas than it uses, it may just use essentially zero natural gas. Answer choice B is completely out of scope - other countries don't matter. Answer choice C is also out of scope - the argument is not discussing alternative energy sources. And answer choice E is irrelevant. Knowing whether any systems have currently been converted (may 1 has, maybe 1,000,000 have) or not doesn't affect this argument.

I hope this helps!


I actually understand this reasoning, but I can't drift away from considering (B) a valid option. I mean, if we evaluate this statement: Malvernia is a country that rely on imported oil. I was indecisive between (B) and (D) and eventually went with (B), it kinda makes sense, no? What if it relies heavily on imported oil, say, for any other production.
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Re: In the past the country of Malvernia has relied heavily on imported  [#permalink]

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New post 11 May 2015, 22:25
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erikvm wrote:
VeritasPrepBrandon wrote:
A "most useful to evaluate" question is typically best approached from a weaken mindset. Look to establish the conclusion and premises, decipher the gap in logic, and then think about how you would attack the gap. The correct answer will be focused on one of the gaps in logic.

Here the argument states that while Malvernia relied heavily on imported oil in the past, the company has implemented a program to convert heating systems from oil to natural gas, and the country is steadily increasing its oil production each year. From these premises the argument concludes that, if these trends continue, Malvernia is likely to experience a reduced dependency on foreign oil in the future. The primary gap in logic here is that this argument is focused on the supply of oil increasing and then one demand of the oil potentially decreasing (heating systems). However, there could be many other oil demands that increase drastically, potentially more than offsetting these factors. Answer D correctly addresses this, because if the amount of oil used for generating electricity and transportation increases greatly, Malvernia may end up depending even more on foreign oil, not less, and thus the conclusion would not hold.

Answer choice A is a pretty irrelevant comparison. Even though Malvernia currently produces more natural gas than it uses, it may just use essentially zero natural gas. Answer choice B is completely out of scope - other countries don't matter. Answer choice C is also out of scope - the argument is not discussing alternative energy sources. And answer choice E is irrelevant. Knowing whether any systems have currently been converted (may 1 has, maybe 1,000,000 have) or not doesn't affect this argument.

I hope this helps!


I actually understand this reasoning, but I can't drift away from considering (B) a valid option. I mean, if we evaluate this statement: Malvernia is a country that rely on imported oil. I was indecisive between (B) and (D) and eventually went with (B), it kinda makes sense, no? What if it relies heavily on imported oil, say, for any other production.


So we already know that Malvernia relies heavily on foreign oil, that is given. Answer choice B only addresses other countries, and whether they rely more or less on foreign oil. Other countries don't matter at all, and that puts B very much out of scope.

I hope this helps!
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Re: In the past the country of Malvernia has relied heavily on imported  [#permalink]

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New post 06 Dec 2015, 22:32
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Import = Demand – Supply

Import of Natural Gas and Oil = (Demand – Supply)NG + (Demand – Supply)oil

Now, we know that the first parenthesized expression is negative and in the second expression, we are only told about supply of oil, not the demand, so the answer choice must be talking about demand of oil.

We see that option D and option E talk about the demand of oil. So, options A, B and C can be eliminated right away.

While option D directly asks whether oil consumption is increasing or not, option E talks about shifting of consumption from oil to natural gas. Since, we are concerned about import of both oil and natural gas; a shift from oil to natural gas will not impact us. It’ll only change whether we need to import oil or natural gas.

Thus, option D is the correct choice.
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Re: In the past the country of Malvernia has relied heavily on imported  [#permalink]

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New post 06 Dec 2015, 22:33
Veritas Prep take on the problem

Let’s break down each answer choice:

(A) The question of when production of oil will outstrip production of gas isn’t really relevant. In fact, if you’re using less oil as a result of the change in heating systems, and oil production is up, it’s possible that you can reduce your dependence on foreign oil without having to produce more oil than gas. A is out.

(B) Whether you are among the most dependent countries on foreign oil doesn’t matter. You are now, and we’re trying to determine if you will be in the future. This doesn’t help. Eliminate B.

(C) Hydroelectric, solar, and nuclear power aren’t relevant for this argument. We know that you’re dependent on foreign oil now, irrespective of other energy sources. It’s increased oil production and switching to gas that will, according to the argument, reduce this dependence. C is out of scope.

(D) Let’s say your oil consumption for electricity and transportation is increasing. Suddenly, the fact that you’re switching heating systems from oil to gas might not help – if your oil needs are going up in other areas, you may remain dependent on foreign oil. But if your oil consumption in these other areas is not increasing, that would reduce your dependence on foreign oil because your heating systems are switching to gas. D looks good.

(E) This doesn’t matter at all. We know that the systems are going to switch from oil to gas, so the question of whether some systems have already made the switch sheds no light on whether you will remain dependent on foreign oil.

D is the answer. Once you have the answer to whether your oil consumption for electricity and transportation is increasing, you’ll be better able to assess whether you will remain dependent on foreign oil, and, consequently, whether your reign as supreme ruler of Malvernia will continue.
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Re: In the past the country of Malvernia has relied heavily on imported  [#permalink]

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New post 17 Apr 2017, 00:58
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gmat2015p wrote:
OG2013 CR Q # 72
OG2017 CR634 P536

In the past the country of Malvernia has relied heavily on imported oil. Malvernia recently implemented a program to convert heating systems from oil to natural gas. Malvernia currently produces more natural gas each year than it uses, and oil production in Malvernian oil fields is increasing at a steady pace. If these trends in fuel production and usage continue, therefore, Malvernian reliance on foreign sources for fuel is likely to decline soon.

Which of the following would it be most useful to establish in evaluating the argument?

(A) When, if ever, will production of oil in Malvernia outstrip production of natural gas?
(B) Is Malvernia among the countries that rely most on imported oil?
(C) What proportion of Malvernia's total energy needs is met by hydroelectric, solar, and nuclear power?
(D) Is the amount of oil used each year in Malvernia for generating electricity and fuel for transportation increasing?
(E) Have any existing oil-burning heating systems in Malvernia already been converted to natural-gas-burning heating systems?


Malvernia
 
Step 1: Identify the Question

In the question stem, the words useful to establish in evaluating indicate that this is an Evaluate the Argument question.

Step 2: Deconstruct the Argument

Past: M lots I oil
Recent: heating oil → gas
Now: make > gas than use
oil prod incr steady
If trends cont → M rely less on foreign fuel

The conclusion is in the form of an if-then statement: If these trends continue, then something else will happen. It’s important to note that the author’s argument is predicated on the idea that the trends will continue. Don’t fall into a trap based on the possibility that the trends will NOT continue; the author hasn’t concluded anything about what might happen if the trends do not continue. The author is only claiming that her conclusion is true if M continues to produce more gas each year than it uses and if oil production keeps increasing at a steady pace.

What does this argument assume? M already has to import oil, but the argument assumes that increasing oil production at a steady pace will allow the country to reduce its oil imports. What if M’s oil consumption is increasing at a much greater pace than its oil production?

Step 3: Pause and State the Goal

On Evaluate questions, the answers will be in the form of a question or a “whether x is true” statement. The correct answer will address an issue on which the argument hinges, depending on whether that statement is true: one way, the argument will be strengthened; the other way, the argument will be weakened.

Step 4: Work from Wrong to Right

(A) The argument does not provide any detail about the relative amounts of oil vs. gas production. Whether M’s oil production outstrips gas production next year or in 20 years, it is still unclear whether the country needs more oil than it produces.
(B) The argument does not compare M to other countries. It is focused solely on whether M will continue to need to import foreign fuel.
(C) If 3% of M’s total needs are currently met by these other energy sources, nothing is changed about the current oil and gas needs as stated in the argument. If 50% of M’s total needs are currently met by these other energy sources, it is still the case that current oil and gas needs are the same as in the argument.
(D) CORRECT. If M needs an increasing amount of oil every year for other uses (electricity and transportation), then it may be the case that M’s oil production is not increasing at a fast enough rate to keep pace with demand. In this case, the argument is weakened. If, on the other hand, M does not need an increasing amount of oil every year for these other needs, then it may be the case that M’s oil production is increasing at a fast enough rate to keep pace with demand, in which case the argument is strengthened.
(E) If none have already been converted, the argument is not impacted because the conclusion is claimed to happen soon; the argument does not say that the conclusion has already occurred. If 1,000 have already been converted, the argument is still not impacted, because the conclusion is still set in the future.
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Re: In the past the country of Malvernia has relied heavily on imported  [#permalink]

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New post 13 Jul 2017, 18:38
(A) When, if ever, will production of oil in Malvernia outstrip production of natural gas? - What if it does outstrip? It does not mean the natural gas production is reducing. Eliminate.
(B) Is Malvernia among the countries that rely most on imported oil? - So what? The plan is to reduce the usage and we need to find out if this plan will be effective. Eliminate
(C) What proportion of Malvernia's total energy needs is met by hydroelectric, solar, and nuclear power? - Out of scope. There is no mention of renewable energy. Eliminate.
(D) Is the amount of oil used each year in Malvernia for generating electricity and fuel for transportation increasing? - Yes. If we find that the oil use is increasing, Malverina might have to keep importing oil at current levels even after spending all the effort to convert its heating to gas. Correct.
(E) Have any existing oil-burning heating systems in Malvernia already been converted to natural-gas-burning heating systems?- Restating the premise. We already know the a recent program has been implemented. The chances are that some systems are already running on gas. Does not affect the premise.
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Re: In the past the country of Malvernia has relied heavily on imported  [#permalink]

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New post 16 Sep 2018, 04:12
gmat2015p wrote:
The Official Guide for GMAT Review, 13th Edition, 2012

Practice Question
Question No.: CR 72
Page: 522

In the past the country of Malvernia has relied heavily on imported oil. Malvernia recently implemented a program to convert heating systems from oil to natural gas. Malvernia currently produces more natural gas each year than it uses, and oil production in Malvernian oil fields is increasing at a steady pace. If these trends in fuel production and usage continue, therefore, Malvernian reliance on foreign sources for fuel is likely to decline soon.

Which of the following would it be most useful to establish in evaluating the argument?

(A) When, if ever, will production of oil in Malvernia outstrip production of natural gas?
(B) Is Malvernia among the countries that rely most on imported oil?
(C) What proportion of Malvernia's total energy needs is met by hydroelectric, solar, and nuclear power?
(D) Is the amount of oil used each year in Malvernia for generating electricity and fuel for transportation increasing?
(E) Have any existing oil-burning heating systems in Malvernia already been converted to natural-gas-burning heating systems?

Malvernia

Step 1: Identify the Question

In the question stem, the words useful to establish in evaluating indicate that this is an Evaluate the Argument question.

Step 2: Deconstruct the Argument

Past: M lots I oil

Recent: heating oil → gas

Now: make > gas than use

oil prod incr steady

If trends cont → M rely less on foreign fuel

The conclusion is in the form of an if-then statement: If these trends continue, then something else will happen. It’s important to note that the author’s argument is predicated on the idea that the trends will continue. Don’t fall into a trap based on the possibility that the trends will not continue; the author hasn’t concluded anything about what might happen if the trends do not continue. The author is only claiming that her conclusion is true if M continues to produce more gas each year than it uses and if oil production keeps increasing at a steady pace.

What does this argument assume? M already has to import oil, but the argument assumes that increasing oil production at a steady pace will allow the country to reduce its oil imports. What if M’s oil consumption is increasing at a much greater pace than its oil production?

Step 3: Pause and State the Goal

On Evaluate questions, the answers will be in the form of a question or a “whether x is true” statement. The correct answer will address an issue on which the argument hinges, depending on whether that statement is true: one way, the argument will be strengthened; the other way, the argument will be weakened.

Step 4: Work from Wrong to Right

(A) The argument does not provide any detail about the relative amounts of oil vs. gas production. Whether M’s oil production outstrips gas production next year or in 20 years, it is still unclear whether the country needs more oil than it produces.

(B) The argument does not compare M to other countries. It is focused solely on whether M will continue to need to import foreign fuel.

(C) If 3% of M’s total needs are currently met by these other energy sources, nothing is changed about the current oil and gas needs as stated in the argument. If 50% of M’s total needs are currently met by these other energy sources, it is still the case that current oil and gas needs are the same as in the argument.

(D) CORRECT. If M needs an increasing amount of oil every year for other uses (electricity and transportation), then it may be the case that M’s oil production is not increasing at a fast enough rate to keep pace with demand. In this case, the argument is weakened. If, on the other hand, M does not need an increasing amount of oil every year for these other needs, then it may be the case that M’s oil production is increasing at a fast enough rate to keep pace with demand, in which case the argument is strengthened.

(E) If none have already been converted, the argument is not impacted because the conclusion is claimed to happen soon; the argument does not say that the conclusion has already occurred. If 1,000 have already been converted, the argument is still not impacted, because the conclusion is still set in the future.




Total Energy required = Oil used from domestic + Oil imported + Other Factors

Now total energy = Natural gas + Domestic Oil + Oil imported + Other Factors

Premise: 1) Domestic Oil is increasing
2) Natural gas is increasing.

Therefore, argument concludes that Oil imported would decrease.

The assumption is that TOTAL ENERGY requirements remain same.

Therefore, D is the correct answer. To identify whether energy requirements are increasing or not.
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Re: In the past the country of Malvernia has relied heavily on imported  [#permalink]

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New post 19 Sep 2018, 06:07
In the past the country of Malvernia has relied heavily on imported oil. Malvernia recently implemented a program to convert heating systems from oil to natural gas. Malvernia currently produces more natural gas each year than it uses, and oil production in Malvernian oil fields is increasing at a steady pace. If these trends in fuel production and usage continue, therefore, Malvernian reliance on foreign sources for fuel is likely to decline soon.

Which of the following would it be most useful to establish in evaluating the argument?


(A) When, if ever, will production of oil in Malvernia outstrip production of natural gas?
Explanation: Not necessary to evaluate the argument. - INCORRECT

(B) Is Malvernia among the countries that rely most on imported oil?
Explanation: IRRELEVANT

(C) What proportion of Malvernia's total energy needs is met by hydroelectric, solar, and nuclear power?
Explanation: If Hydro+Solar+Nuclear is only 1 % and the remaining depends on oil, then Malvern's may have to rely on foreign sources but the situation would exact opposite if majority of the needs are met by other sources of power in Malveria.INCORRECT

(D) Is the amount of oil used each year in Malvernia for generating electricity and fuel for transportation increasing?
Explanation: Malveria may have to rely on foreign sources if the requirements are increasing every year. - CORRECT

(E) Have any existing oil-burning heating systems in Malvernia already been converted to natural-gas-burning heating systems?
Explanation: IRRELEVANT

Hence I chose D
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Re: In the past the country of Malvernia has relied heavily on imported &nbs [#permalink] 19 Sep 2018, 06:07
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In the past the country of Malvernia has relied heavily on imported

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