Please explain the CR

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src_saurav: Master | Next Rank: 500 Posts; Posts: 145; Joined: Sun Mar 15, 2015 7:27 amFollowed by: 1 member; Thanked: 2 times

by src_saurav » Wed Apr 29, 2015 9:05 am

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.
(B) Many municipalities have old wastewater purification systems that need to be replaced.
(C) Conventional wastewater purification systems have not been fully successful in killing bacteria at cold
temperatures.
(D) During times of warm weather, when it is not in use, QuickFreeze's purification system requires relatively
little maintenance.
(E) Places where the winters are cold rarely have a problem of water shortage.

What is the answer and reasons ?

I will tell the answer but later.

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Source: Beat The GMAT — Critical Reasoning | Wed Apr 29, 2015 9:05 am

fulltapori: Senior | Next Rank: 100 Posts; Posts: 35; Joined: Mon Feb 27, 2012 11:14 pm; Thanked: 1 times

by fulltapori » Thu Apr 30, 2015 1:27 am

I would go with C, if the only problem that conventional systems have is killing the bacteria " at cold temperatures" then installing the QuickFreeze's purification system would solve that problem.

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GMATGuruNY: GMAT Instructor; Posts: 15539; Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members; Location: New York, NY; Thanked: 13060 times; GMAT Score:790

by GMATGuruNY » Thu Apr 30, 2015 6:46 am

src_saurav wrote: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.
(B) Many municipalities have old wastewater purification systems that need to be replaced.
(C) Conventional wastewater purification systems have not been fully successful in killing bacteria at cold
temperatures.
(D) During times of warm weather, when it is not in use, QuickFreeze's purification system requires relatively
little maintenance.
(E) Places where the winters are cold rarely have a problem of water shortage.

This is essentially a RESOLVE/EXPLAIN CR.
In a resolve/explain CR, the correct answer must explain how two facts that seem to contradict each other can be true at the same time.

FACT 1: A municipality that purchases QuickFreeze's purification system will still need to maintain a conventional system.
FACT 2: Despite this costly downside, municipalities will purchase QuickFreeze's purification system.

How can both facts be true at the same time?
QuickFreeze's system must provide a BENEFIT that OUTWEIGHS the system's costly downside.
C: Conventional wastewater purification systems have not been fully successful in killing bacteria at cold temperatures.
Here, the benefit is clear: QuickFreeze's system can kill bacteria that conventional systems cannot.

The correct answer is C.

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Needgmat: Master | Next Rank: 500 Posts; Posts: 234; Joined: Tue May 31, 2016 1:40 am; Thanked: 3 times

by Needgmat » Wed Jul 06, 2016 7:15 am

Hi GMATGuruNY,

To be very honest, I still don't understand the question and how should I approach this one?

Is this a strength question or something else?

Please explain.

Many thanks in advance,

Kavin

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OptimusPrep: Master | Next Rank: 500 Posts; Posts: 410; Joined: Fri Mar 13, 2015 3:36 amFollowed by: 8 members; Location: Worldwide; Thanked: 120 times; GMAT Score:770

by OptimusPrep » Thu Jul 07, 2016 8:56 am

src_saurav wrote: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.
(B) Many municipalities have old wastewater purification systems that need to be replaced.
(C) Conventional wastewater purification systems have not been fully successful in killing bacteria at cold
temperatures.
(D) During times of warm weather, when it is not in use, QuickFreeze's purification system requires relatively
little maintenance.
(E) Places where the winters are cold rarely have a problem of water shortage.

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

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