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Most of the world's supply of uranium currently comes from the mines.

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Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post Updated on: 07 Oct 2017, 03:34
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Most of the world's supply of uranium currently comes from the mines. It is possible to extract uranium from seawater, but the cost of doing so is greater than the price that Uranium fetches on the world market. Therefore, until the cost of extracting uranium from seawater can somehow be reduced, this method of obtaining uranium is unlikely to be commercially viable.

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

(A) Whether the uranium in deposits on land is rapidly being depleted

(B) Whether most uranium is used near where it is mined

(C) Whether there are any technological advances that show promise of reducing the costs of extracting uranium from seawater

(D) Whether the total amount of Uranium in seawater is significantly greater than the total amount of uranium on land

(E) Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater

Originally posted by gmat blows on 17 Jun 2008, 11:38.
Last edited by hazelnut on 07 Oct 2017, 03:34, edited 5 times in total.
Edited the question.
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 17 Jun 2008, 12:25
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Tricky one, but I would pick A.

Quote:
Most of the world's supply of uranium currently comes from the mines. It is possible to extract uranium from seawater, but the cost of doing so is greater than the price that Uranium fetches on the world market. Therefore, until the cost of extracting uranium from seawater can somehow be reduced, this method of obtaining uranium is unlikely to be commercially viable.

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

a. Whether the uranium in deposits on land is rapidly being depleted (could be. Reasoning here: deposits on land depleted -> price of Uranium on the world market goes up -> obtaining uranium from seawater becomes viable even if the cost of extracting remains the same -> the conclusion is not true. Other option: deposits on land are not depleted -> price of Uranium stands still -> extracting uranium from seawater at current price is not viable -> the conclusion is true.)

b. Whether most uranium is used near where it is mined (not relevant)

c. Whether there are any technological advances that show promise of reducing the costs of extracting uranium from seawater (This might seem as the answer, but I think it is not. Notice that we needn’t to know whether the cost of extracting of uranium from the seawater will go down. We have to verify the claim ‘Unless the cost goes down, this method won’t be viable’ – which is not the same. And the information about the promise of reducing cost doesn’t help us to verify the claim. Here we have only costs go down - > extracting from seawater may be viable. But we in fact need some info about the situation when the costs of extracting will NOT go down, BUT the obtaining uranium from seawater becomes profitable)

d. Whether the total amount of Uranium in seawater is significantly greater than the total amount of uranium on land (doesn’t help us either. Perhaps the amount of uranium on land, while less than in seawater, is still sufficient to satisfy the market demand)

e. Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater. (doesn’t help us since the argument considers only the issue of sea-water-extracted uranium)
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 17 Jun 2008, 12:00
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gmat blows wrote:
Most of the world's supply of uranium currently comes from the mines. It is possible to extract uranium from seawater, but the cost of doing so is greater than the price that Uranium fetches on the world market. Therefore, until the cost of extracting uranium from seawater can somehow be reduced, this method of obtaining uranium is unlikely to be commercially viable.

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

a. Whether the uranium in deposits on land is rapidly being depleted
b. Whether most uranium is used near where it is mined
c. Whether there are any technological advances that show promise of reducing the costs of extracting uranium from seawater
d. Whether the total amount of Uranium in seawater is significantly greater than the total amount of uranium on land
e. Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater.


-----
I was able to narrow down to A, C, and D
Ive convinced myself that 'technological advaces' to reduce cost was slighltly a shift of scope.
now, between A and D. I feel that they are almost synonymous in meaning. It would be important to know whether the uranium is being depleted (if not, then extracting from seawater is not needed). However, doesnt D) somewhat imply the same thing? If there isnt alot of uranium in the seawater to begin with, then the even the reduction in cost would not be worth it?

Am i thinking too much about this?
thanks.


Lets just compare A and D.

First D. it compares the total amount of Uranium in seawater and Land. lets just say amount of U in seawater is 1000 and on land its 100. But it doesnt talk about the usage. May its possible that whatever amount is available on land, it'll last forever and we may never need to take it out from seawater

Lets see A. As the U deposit on land is depleting fast, we may landup in a situation where we have to extract U from seawater, even if it costs more than mining on land.

Clearly A wins
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 17 Jun 2008, 12:09
I'd slide towards C.

I belive we need to evaluate this argument (until the cost of extracting uranium from seawater can somehow be reduced...) by actually verifying the progress that has been made or by evaulating the efforts underway to reduce the cost. Hope it makes sense.

What is the OA. Is this from GMAT prep?
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 17 Jun 2008, 12:20
C doesn't looks right to me since , we know that if the cost can be reduced than the seawater uranium could be of some help . So by c you will come to know that the technological advanced have been made or not...but how will you evaluate the argument on the basis of that...the argument already states that if somehow the cost can be reduced..which will be thru soe technological advances only.....

i don't get..why C?
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 17 Jun 2008, 12:24
Guys, I havent really started studying CR and this is the first time I've come across a question stem like the one mentioned here.

Which of the following would it be most useful to determine in evaluating the argument? -- Does this mean weaken/undermine the argument in this question??
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 17 Jun 2008, 13:29
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definitely A. It would be economical to use seawater uranium extraction if either cost is reduced or price goes up. The argument states that the cost has to be reduced which is true only is price doesn't go up. Depletion of supply will definitely cause price to go up.
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 01 Jan 2009, 19:42
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Seems to be A for the reasons mentioned above.

rapid depletion on land will make the extraction from seawater a necessity and hence commercially viable.
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 20 Jan 2012, 23:35
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My answer is also A.

If I were a VC and need to start doing the business of extracting uranium from sea water, I will go with A because that is the shortest way to determine the success of my venture. Sure, C also helps, but it takes time. And the question is about 'most useful', hence A wins over C.
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 21 Jan 2012, 02:29
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i"ll go with A...
This Q is about evaluating the argument, If uranium in deposits on land is not rapidly being depleted, then y we should be bothered about technology advances and extracting uranium from seawater
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 21 Jan 2012, 03:21
riteshv wrote:
i"ll go with A...
This Q is about evaluating the argument, If uranium in deposits on land is not rapidly being depleted, then y we should be bothered about technology advances and extracting uranium from seawater


I disagree with your reasoning...

the question is all about - should we need to extract uranium from seawater, what do we need to know. But your reasoning is like- should we need to extract uranium from seawater. There is a big difference.
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 22 Jan 2012, 21:23
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vksunder wrote:
Guys, I havent really started studying CR and this is the first time I've come across a question stem like the one mentioned here.

Which of the following would it be most useful to determine in evaluating the argument? -- Does this mean weaken/undermine the argument in this question??


Start with the videos at the website

www.gmatprepnow.com

They have all the lesson modules of CR, RC and SC are free. Atleast you ll get an idea what you are heading into in Verbal Section.
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 22 Jan 2012, 21:33
debaranjansahoo wrote:



They have all the lesson modules of CR, RC and SC are free. Atleast you ll get an idea what you are heading into in Verbal Section.


Thanks man for sharing the link. But when I clicked on a module, no video is coming up. Need to verify on a different computer.
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 27 Jul 2013, 02:24
i can't understand why A is the answer.. i would choose this option only in a "weaken question", but this is an "evaluation question"; my kaplan book says: "The correct answer won't strengthen or weaken the author's reasoning or supply a missing assumption. Instead, the right answer will specify the kind of evidence that you would help you to judge the validity of the author's argument"
this is the reason why i'd chose C
can someone helps me?
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 27 Jul 2013, 02:54
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lucasITA wrote:
i can't understand why A is the answer.. i would choose this option only in a "weaken question", but this is an "evaluation question"; my kaplan book says: "The correct answer won't strengthen or weaken the author's reasoning or supply a missing assumption. Instead, the right answer will specify the kind of evidence that you would help you to judge the validity of the author's argument"
this is the reason why i'd chose C
can someone helps me?


We want to evaluate this:

Therefore, until the cost of extracting uranium from seawater can somehow be reduced, this method of obtaining uranium is unlikely to be commercially viable.

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

a. Whether the uranium in deposits on land is rapidly being depleted
This is the correct answer. If the deposits on land are rapidly being depleted, the uranium's price is going to be higher so despite the high costs, the method of obtaining uranium will be commercially viable.

c. Whether there are any technological advances that show promise of reducing the costs of extracting uranium from seawater
I) show promise of reduce != will reduce
II) determining the possible existence of such technologies does not help us in evaluating the argument
(...) until the cost of extracting uranium from seawater can somehow be reduced (...) <== it has no effect on this
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 03 Sep 2013, 06:55
icandy wrote:
Seems to be A for the reasons mentioned above.

rapid depletion on land will make the extraction from seawater a necessity and hence commercially viable.



I agree that rapid depletion on land will make the extraction from seawater a necessity, but how it makes it commercially viable then ?

Could anyone answer?

Thanks
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 04 Sep 2013, 00:24
gmat blows wrote:
Most of the world's supply of uranium currently comes from the mines. It is possible to extract uranium from seawater, but the cost of doing so is greater than the price that Uranium fetches on the world market. Therefore, until the cost of extracting uranium from seawater can somehow be reduced, this method of obtaining uranium is unlikely to be commercially viable.

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

a. Whether the uranium in deposits on land is rapidly being depleted
b. Whether most uranium is used near where it is mined
c. Whether there are any technological advances that show promise of reducing the costs of extracting uranium from seawater
d. Whether the total amount of Uranium in seawater is significantly greater than the total amount of uranium on land
e. Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater.


From the list of options, I left myself with A and C. What made (A) not an answer for me was the face that the question asked about commercial viability. If uranium deposits on land deplete themselves, we will have to start extracting from seawater. This doesn't address costs at all, so I chose (C).
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 24 Sep 2014, 01:39
D would have been right if it was mentioned that amount of uranium per unit of seawater is higher that amount of uranium per unit of land
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 05 Mar 2015, 05:53
Before everything, let's break down the prompt into pieces
• Uranium mostly come from mines. An alternative source would be from seawater, but it is too costly.
• Argument: Cost of extracting uranium from seawater should decrease to consider this option.

(A) Whether the uranium in deposits on land is rapidly being depleted
- Correct answer. It is important to know whether mining uranium will still be a viable option or not. If it is rapidly depleting, obtaining uranium from seawater will be the ONLY viable option. If it is not rapidly depleting, then it is not a viable option.
(B) Whether most uranium is used near where it is mined
- This is irrelevant to the argument, as this does not address whether extracting uranium in seawater could be an option
(C) Whether there are any technological advances that show promise of reducing the costs of extracting uranium from seawater
- This is future-driven. If there are technological advances that show promise of reducing the cost, it still does not make uranium extraction from seawater a viable option for now.
(D) Whether the total amount of Uranium in seawater is significantly greater than the total amount of uranium on land
- Irrelevant. What is important is the costly process of extraction, and not necessarily the total amount of uranium that can be extracted
(E) Whether uranium can be extracted from freshwater at a cost similar to the cost of extracting it from seawater.
- The question is whether it will be better to extract uranium in the mines or from seawater. And if it is too costly to extract from seawater, it would be efficient to extract from mines. This does not make extracting from seawater a viable option for now.
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Re: Most of the world's supply of uranium currently comes from the mines.  [#permalink]

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New post 19 Nov 2015, 15:54
I will take C, as because viability will be proved if

i) cost of fetching gets reduced and/or
ii) Market price goes up by any means, to make up for the high cost of fetching.

the conclusion tells us to consider case i), i.e until the cost of fetching is reduced.

Only C mentions sth about reducing the cost of fetching.
Re: Most of the world's supply of uranium currently comes from the mines. &nbs [#permalink] 19 Nov 2015, 15:54

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