Snowmaking machines work by spraying a mist that freezes immediately

I am not an expert but may be my 2 cents may help you get the point of the argument.

What are we looking for ? We are looking for a reason to buy QUICK freezer at first place when they have conventional system.

B :- It tells us that we have old QUICK FREEZER that needs to be repllaced but it does not tell us that why the municipality will but it when they have conventional system

C;- It correctly tells the reason why we need a Quick freezer in winter season.

HTH

B old system need replacement . municipality can purchase any not imp this new one

C the conventional one does not work in winter. . we need a new one a different one for winter so this one can do the job

(A)Bacteria are not the only impurities that must be removed from wastewater.
Makes no impact. On the other hand could be just weakening the weightage of the Municipalities trying to buy the Quick Freeze machines

(B)Many Municipalities have old wastewater Purification Systems that need to be replaced.
Does not help us to justify acquisition of Quick Freeze machines

(C)Conventional wastewater purification systems have not been fully successful in killing bacteria at cold temperatures.
The option which best supports the prediction by showing a limitation in Municipalities which can be fixed by using QuickFreeze machines

(D)During times of warm weather, when it is not in use, QuickFreeze's purification system requires relatively little maintenance.
Does not give Municipalities a reason to buy Quick Freeze systems
(E)Places, the where the winters are cold rarely have a problem of water on shortage.
The statement leads us nowhere.

Snowmaking machines work by spraying a mist that
freezes immediately on contact with cold air. Because
the sudden freezing kills bacteria, QuickFreeze is
planning to market a wastewater purification system
that works on the same principle. The process works
only when temperatures are cold, however, so
municipalities using it will still need to maintain a
conventional system.

Which of the following, if true, provides the strongest
grounds for a prediction that municipalities will buy
QuickFreeze's purification system despite the need to
maintain a conventional purification system as well?

(A) Bacteria are not the only impurities that must be
removed from wastewater.

IMO , this is correct as the QF kills only bacteria we need CONV systems to kill other impurities found in water.So this statement clears that we need CONV system for other impurities and QF for bacteria.

(B) Many municipalities have old wastewater
purification systems that need to be replaced.

Doesn't tell why we need to keep CONV systems

(C) Conventional wastewater purification systems
have not been fully successful in killing bacteria
at cold temperatures.

This tells us that CONV systems are unable to kill bacteria but doesn't tell whether we need to keep CONV systems or not

(D) During times of warm weather, when it is not in
use, QuickFreeze's purification system requires
relatively little maintenance.
OOS

(E) Places where the winters are cold rarely have a
problem of water shortage.

OOS

Reasoning as mentioned above, need a discussion on this so that we can reach consensus.

Rgds,
saurabh

Thank you e gmat. I am e gmat customer.
the process you do before going to answer choices is prethinking. I think that the success on cr is based on this prethinking. we need to do something before going to answer choices. we need to be armed with something before looking at the answer choices which are traps.
your prethinking is great.

however, the following question from gmatprep is hard for us to prethink an assumption. pls help us prethink . thank you.
press-secretary-our-critics-claim-that-the-president-s-16458.html

Press secretary: Our critics claim that the President's recent highway project cancellations demonstrate a vindictive desire to punish legislative districts controlled by opposition parties. They offer as evidence the fact that 90% of the projects cancelled were in such districts. But all of the cancelled projects had been identified as wasteful in a report written by respected nonpartisan auditors. So the President's choice was clearly motivated by sound budgetary policy, not partisan politics.
Which of the following is an assumption on which the press secretary's argument depends?
A. Canceling highway projects was not the only way for the President to punish legislative districts controlled by opposition parties.
B. The scheduled highway projects identified as wasteful in the report were not mostly projects in districts controlled by the President's party.
C. The number of projects cancelled was a significant proportion of all the highway projects that were to be undertaken by the government in the near future.
D. Nonpartisan auditors were President's friends.
E. Reports by nonpartisan auditors are not generally regarded by the opposition parties as a source of objective assessment of government projects.

In C ,What is the need of maintaining a conventional system when the QF is eliminating all the bacteria ?

If option C is the answer it is contradicting the question stem,in my opinion.

Look at the last statement of the passage:

"he process works only when temperatures are cold, however, so municipalities using it will still need to maintain a conventional system"



How does it contradict the question stem?

Before you respond, please remember that this is an official question and by thinking that this is incorrect in one way or the other, we just mean that we are not able to understand it. The official questions ARE ALWAYS CORRECT.

Thanks,
Chiranjeev

As per my knowledge there r questions in official gmat which are ambiguous in nature.

The only point on which I said C is ambiguous because the CR clearly mentioned that if QF should be used ,it should be used along with the conventional purification system.My question is what is the use Conventional purification when QF is doing the whole purification?

If the option reworded as " QF is used during cold temperature and during hot temperatures QF is replaced with conventional system" then the option is apt according to the info given in the CR i.e QF only works in the cold temperature.

In this type of ambiguous que I usually go with POE.

I hope you understood what I mean to say.

It might be true but even if it is so, it applies to only around 1% of the questions. However, this knowledge is dangerous since you may apply this knowledge to every CR question you are not able to understand. So, you should be very very careful when you use this knowledge to challenge official questions.



The point is that QF works at cold temperatures only. So, you need another system that would work at not-so-cold temperatures. For example: a lot of air conditioners work only during summers when they lower down the room temperature; during winters, you need heaters to make the room temperature moderate. It does not mean that either air conditioners or heaters are not required. Both are required at different times.


The option statement need not be reworded. Rather, the rewording you are suggesting does not present any problem with using conventional systems during cold weather. How does this reworded option statement make you believe that the municipalities will buy QF?

-Chiranjeev

OA is c.

My approach : prediction- Municipalities will buy QF despite the need to maintain a conventional one as well. Strongest ground for this prediction will be something that supports this decision of maintaining QF despite the already present conventional one. Now, why on earth will the municipality buy QF when it already has the conv. one? Only when the QF gives some advantage over the one already in use. So, prethinking on this line, would help you to look out for an option that mentions an ADVANTAGE of QF over the conv. one. Any aspirant who prethinks on this line, is bound to mark the right answer..
Now, lets start with options.
Option A does not address the right issue. We need the option to discuss an ADVANTAGE of QF. Rather this option points out some flaw in the system ( There are other micro organisms present in the water, but sadly, QF cannot help us remove them ). This option, if anything, weakens the prediction. Therefore option A is incorrect.
Option B Fine. Many municipalities might have old waste water systems that need replacement. But then, even if it is true, how does it strengthen the fact that QF is needed despite the conventional one. ( Remember, the question does not want to replace the old systems with QF alone. It wants us to consider a case where QF would be needed despite the conv. one ). Therefore this statement digresses from the main line of prediction . You can also think it from a different angle. Since this option does not deal with the advantage of QF over conv., it's wrong.
Option C is correct , because it rightly discusses the advantage of QF. ( Remember, no one is mad to use QF despite having conv. one if QF has no advantage over the conv. purifier.
Option D This does deal with a good point about the QF. Great!!!. maintenance can be a factor, but its always secondary to the advantage mentioned in Option C. Honestly speaking, this can be the answer, but only when a better option like C is not present.Also, the option might address the fact that QF is great to use, but it does not mention a reason of using it, even when a conventional one is already present.
Option E is straightaway irrelevant.

Hope it helps. Kindly show support..

Snowmaking machine produces mist that freezes immediately and kills bacteria
QuickFreeze is making purification system based on this but it works only in cold temperature.

We need to give a reason why municipalities will buy this inspite of the limitation.

Only option C tells us the reason by saying that the conventional methods do not work in cold environment
Hence QuickFreeze can fill the gap.

Correct Option: C

Which of the following, if true, provides the strongest grounds for a prediction that municipalities will buy QuickFreeze's purification system despite the need to maintain a conventional purification system as well?

(A) Bacteria are not the only impurities that must be removed from wastewater. Even if there are other impurities whether existing conventional purification system is able to counter or not is not relevant as we need for strengthener something which provides us with the reason what extra benefit Quick Freeze purification system is able to provide. So in nut shell not affecting the argument at all

(B) Many municipalities have old wastewater purification systems that need to be replaced.It does not provides us with the reason of why we need Quick Freeze purification system. It does not strengthens the argument

(C) Conventional wastewater purification systems have not been fully successful in killing bacteria at cold temperatures.CORRECT as conventional system does not works in winter...Hence we would require Quick Freeze purification system additionally

(D) During times of warm weather, when it is not in use, QuickFreeze's purification system requires relatively little maintenance.- Out of Scope as we are not concerned with the maintenance cost here

(E) Places where the winters are cold rarely have a problem of water shortage - Out of Scope

Question Type: Strengthen

Premise 1: Since sudden freezing kills bacteria, Quickfreeze, is planning to market a waste water purification system, that works on the principle of snow making machines.

Conclusion: Municipalities planning to use quick freeze will still have to maintain their conventional systems, as quick freeze works only in cold temperatures.

Analysis: Since the question is asking to strengthen this decision taken by the municipalities, there needs to be a compelling reason for them to bear the additional cost of Quick freeze in addition to conventional systems. Either Quickfreeze provides a benefit which it does since it kills bacteria at cold temperatures, which conventional systems may or may not or in cold temperatures due to harsh weather conditions Quickfreeze is an easier method to deploy than conventional systems. The correct answer needs to support the use of quick freeze in winters despite conventional systems still being operational.

(A) Bacteria are not the only impurities that must be removed from wastewater. - Hence the simultaneous requirement of conventional system, however does not strengthen the need for Quick freeze, Incorrect

(B) Many municipalities have old wastewater purification systems that need to be replaced. - Argument does not say about anything replacing conventional system. Incorrect.

(C) Conventional wastewater purification systems have not been fully successful in killing bacteria at cold temperatures. - Hence at Cold temperatures the municipalities need an alternate method to kill this bacteria, therefore Quick freeze is required. Perfect. Correct

(D) During times of warm weather, when it is not in use, QuickFreeze's purification system requires relatively little maintenance. Not enough a compelling reason to use quick freeze. Incorrect

(E) Places where the winters are cold rarely have a problem of water shortage. Out of context. Incorrect.


Thanks,
GyM

Hi Experts and All,

Can you please help me with a concrete reason to reject option D?
Option C states that conventional water systems aren't successful in cold temperatures.

This tends to weaken the conclusion as per me. My thought process is - Since, we do not know till now what would happen in summer ( hotter) periods ( because it is not mentioned in the argument ) , we can confidently say that in colder times, QuickFreeze is better ( as per the option)? That means this option gives me a belief to lower my belief in the conclusion right?

On the similar lines, option D says that it's easier to maintain the QuickFreeze in hotter periods. Though I agree that it does not say anything about the conventional water systems, it's still an additional advantage to maintain Quickfreeze in summers ( hotter periods) because they can't be use then and use conventional water in times of summer?

Please suggest where did I go wrong?

Regards,
Rishav

Hi rish2708,

I am happy to help you.

You have made a lot of points in your explanation. But advice for you is that keep a sharp eye on conclusion and premises in CR question and know it how to differentiate between the two.

Now, the conclusion is the prediction that municipalities will buy Quickfreeze's purification system despite the need to maintain a conventional system.

Negating the above conclusion we get that in what scenario, municipalities need not maintain QF despite having a conventional system. The scenarios would be that QF provides no additional advantage under any circumstance. But if QF can provide an advantage, say that in winter conventional systems do not work, then QF would be required and any such statement would strengthen my conclusion. That is why the correct answer choice is c

Also, it is mentioned in the premise that QF works in cold, therefore there is no need to form an assumption about summers. But the conventional system does not work in winter is a valuable information

Also, in Option D, QF has low maintenance will not strengthen it as we do not keep anything just because something has low maintenance. We keep something because of a utility. That is there in option c.

I hope my explanation helps.

Thanks Wonderwoman31

I wrongly assumed the conclusion to be municipalities need to maintain the conventional purifiers despite buying the new ones ( the last line of the argument).

I did not see and focussed on the question stem properly.
I agree that if this is the conclusion, your explaination helps.

And since the conclusion by which I was evaluating the answer choices was itself wrong, I was evaluating it with wrong reasoning.

Thanks for pointing out the same!!
Regards,
Rishav

Hi Chiranjeev,

Hope you’re still around to answer this question since it looks like it’s been so long!

Let’s first analyze this sentence (seems like a conclusion to me): “The process works only when temperatures are cold, however, so municipalities using it will still need to maintain a
conventional system.” This sentence essentially means, “QF is great, but since its weakness is that it only works in the cold weather, municipalities will need the conventional system, which ca provide something that QF cannot, or has some qualities that can offset QF’s weakness. That is why they still NEED the conventional system, even though QF sounds great.”

Now, move on to the question stem. It asks, “Which of the following, if true, provides the strongest grounds for a prediction that municipalities will buy QuickFreeze's purification system despite the need to maintain a conventional purification system as well?”
It’s not that they HAVE the conventional purification system, like what you said in your explanation, they NEED to maintain the conventional system. So again, in this question, it looks for an answer that not only touts the irresistible qualities of QF, but also something irreplaceable about the conventional system which makes them have to keep it AS WELL.

Therefore, I don’t feel comfortable with answer choice C. Choice C would be the answer, in my opinion, if the question was “Which of the following, if true, provides the strongest
grounds for a prediction that municipalities will buy QuickFreeze's purification system?” Answer: “(C) Conventional wastewater purification systems have not been fully successful in killing bacteria at cold temperatures.”

Answer C only explains why they want to buy QF, not why they want to buy QF while still need the conventional system.

I guess my problem with this question is the wording, which leads me to believe that the conclusion of the passage is that “so municipalities using it will still need to maintain a conventional system.” The structure is this: Municipalities have both conventional system and QF. QF is a great machine/ process. However, it only works in cold weather. Therefore, municipalities will still need to maintain a conventional system.” I was taught in numerous GMAT lessons to pick up on these connectors: however, so, despite, as well etc to understand the direction And tone of the paragraph. However, doing just that leads me to the wrong answer here. If I had not paid attention to these words “however” “so” “still” need” “as well”, I would have chosen C. C could be a stretch answer to me if I strip the question and the answer C to the bare minimum. However, if I do that to all other questions, then I’d get the other questions wrong. So I’m having a dilemma here and I don’t know what lessons I can draw from this question.

Please kindly explain. Thanks!