Last visit was: 23 May 2024, 09:42 It is currently 23 May 2024, 09:42
Close
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Close
Request Expert Reply
Confirm Cancel
SORT BY:
Date
Tags:
Show Tags
Hide Tags
avatar
Intern
Intern
Joined: 05 Jun 2011
Posts: 3
Own Kudos [?]: 42 [42]
Given Kudos: 0
Send PM
Most Helpful Reply
Intern
Intern
Joined: 30 Apr 2011
Posts: 11
Own Kudos [?]: 17 [5]
Given Kudos: 0
Send PM
General Discussion
avatar
Intern
Intern
Joined: 05 Jun 2011
Posts: 3
Own Kudos [?]: 42 [0]
Given Kudos: 0
Send PM
User avatar
Manager
Manager
Joined: 28 Apr 2011
Posts: 68
Own Kudos [?]: 29 [0]
Given Kudos: 6
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
Plz give more explanations.........still not clear why not D.......

Doesn't saved from being suffocated means aved from being killed.
User avatar
Intern
Intern
Joined: 09 Apr 2012
Posts: 48
Own Kudos [?]: 194 [3]
Given Kudos: 29
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
3
Kudos
I doubt if this is a text from GMAT.
I feel comfortable to assume that such a question is a creation of GMAT Tutors/ Private Organizations that prepare these questions for students benefit.

If this is infact a GMAT question, i expect it to be more precise as in option B.
There is an ambiguity here, other boats?? -- what are other boats?? -- 1)other boats of the same company or 2)other boats of different company that did not install the alarms??

Depending on the above, i would go with D if 1, i.e the other boats are mentioned as bpats of the same company, bcoz in such a case, B looses its importance as the average is already mentioned down to 1 from 8, so D is better as it supports the facts with its info.

But if other boats mean boats of other companies, I would go with B........ again if it says that other boats have no alarms installed on it.

This is my opinion, and if there are any experts around here, please thrash me if you feel my reasoning is wrong.
avatar
Intern
Intern
Joined: 28 Feb 2014
Posts: 2
Own Kudos [?]: [0]
Given Kudos: 10
WE:Information Technology (Computer Software)
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
The right choice would be "B" and here's why:
When the option says "other boats" it definitely mean boats of other organizations which have not installed alarms, since the porpoises would scatter away and even if some of the "other" boats were of the same organization they would have alarms installed again scattering them away.. but now the ones which don't have such alarms would cause a problem.
avatar
Manager
Manager
Joined: 23 May 2014
Posts: 95
Own Kudos [?]: 89 [2]
Given Kudos: 6
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
2
Kudos
commandos1985 wrote:
To prevent harbor porpoises from getting tangled in its nets and suffocating, a fishing company installed acoustic alarms on all its boats that fish in waters off Massachusetts. The sound emitted temporarily disorients the porpoises and frightens them away. Since the installation of the alarms, the average number of porpoises caught in the company's nets has dropped from eight to one per month. The alarms, therefore, are saving the lives of harbor porpoises in those waters.

Which of the following is an assumption on which the argument depends?

A. The use of acoustic alarms increases the number of commercial fish caught by the fishing company's boats.

B. When disoriented, harbor porpoises are not significantly more likely to be killed by other boats.

C. Environmentalists advocate the use of acoustic alarms as a means of protecting the harbor porpoise population.

D. The alarms were installed at the time of year when harbor porpoises are most plentiful in the Massachusetts waters.

E. The cost of installing acoustic alarms on fishing boats is less than the cost of repairing nets damaged by harbor porpoises.


The conclusion here is that the alarms are saving lives.
B - If the alarm is causing harbor porpoises to get killed by other boats, then ultimately the alarms are not saving lives.

D - If we negate this option, we cannot say for sure whether the alarms are saving lives or the population is less in general and therefore not many porpoises are getting killed.
does not have the impact that B has.
Manager
Manager
Joined: 13 Jul 2015
Posts: 79
Own Kudos [?]: 44 [1]
Given Kudos: 41
Location: Singapore
Schools: LBS '21 (M)
GMAT 1: 730 Q50 V39
WE:Operations (Investment Banking)
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
1
Kudos
vdbhamare wrote:
Plz give more explanations.........still not clear why not D.......

Doesn't saved from being suffocated means aved from being killed.


I'm 3 years late in replying you haha. oh wells.

Option D is: The alarms were installed at the time of year when harbor porpoises are most plentiful in the Massachusetts waters

So what if harbor porpoises are most plentiful? Maybe the number of boats increased too? Larger population/Much larger boat population also can achieve a drop from 8-->1

What B is saying that, yes, the company registered a drop from 8 --> 1 of those CAUGHT IN NETS, but what about those disoriented porpoises that just swim straight into a boat and gets killed by other means? maybe they swam into the boats rotor which sliced them up? so the company registers a drop in those caught by nets but doesn't consider other possible means of death
Verbal Forum Moderator
Joined: 08 Dec 2013
Status:Greatness begins beyond your comfort zone
Posts: 2099
Own Kudos [?]: 8865 [1]
Given Kudos: 171
Location: India
Concentration: General Management, Strategy
GPA: 3.2
WE:Information Technology (Consulting)
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
1
Kudos
To prevent harbor porpoises from getting tangled in its nets and suffocating, a fishing company installed acoustic alarms on all its boats that fish in waters off Massachusetts. The sound emitted temporarily disorients the porpoises and frightens them away. Since the installation of the alarms, the average number of porpoises caught in the company's nets has dropped from eight to one per month. The alarms, therefore, are saving the lives of harbor porpoises in those waters.

Type - Assumption
-Fishing company has installed alarms on boats
-Sound emitted temporarily disorients the porpoises and frightens them
- Monthly Average number of porpoises caught in nets has dropped from 8 to 1 .
Conclusion - Alarms are saving the lives of porpoises

Which of the following is an assumption on which the argument depends?

A. The use of acoustic alarms increases the number of commercial fish caught by the fishing company's boats. Irrelevant

B. When disoriented, harbor porpoises are not significantly more likely to be killed by other boats. Correct answer - if this is true , the alarms are not saving the lives of porpoises

C. Environmentalists advocate the use of acoustic alarms as a means of protecting the harbor porpoise population. Irrelevant - the opinion of Environmentalists does not matter

D. The alarms were installed at the time of year when harbor porpoises are most plentiful in the Massachusetts waters. Incorrect - the quantity does not matter as long as the alarms are saving the lives the porpoises .Also , even if we negate this , the alarms were installed at the time of year when porpoise population was below the peak , the alarms might still help in saving lives .

E. The cost of installing acoustic alarms on fishing boats is less than the cost of repairing nets damaged by harbor porpoises. Irrelevant

Answer B
Manager
Manager
Joined: 26 Feb 2015
Posts: 61
Own Kudos [?]: 196 [0]
Given Kudos: 109
GPA: 3.92
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
Skywalker18 wrote:
To prevent harbor porpoises from getting tangled in its nets and suffocating, a fishing company installed acoustic alarms on all its boats that fish in waters off Massachusetts. The sound emitted temporarily disorients the porpoises and frightens them away. Since the installation of the alarms, the average number of porpoises caught in the company's nets has dropped from eight to one per month. The alarms, therefore, are saving the lives of harbor porpoises in those waters.

Type - Assumption
-Fishing company has installed alarms on boats
-Sound emitted temporarily disorients the porpoises and frightens them
- Monthly Average number of porpoises caught in nets has dropped from 8 to 1 .
Conclusion - Alarms are saving the lives of porpoises

Which of the following is an assumption on which the argument depends?

A. The use of acoustic alarms increases the number of commercial fish caught by the fishing company's boats. Irrelevant

B. When disoriented, harbor porpoises are not significantly more likely to be killed by other boats. Correct answer - if this is true , the alarms are not saving the lives of porpoises

C. Environmentalists advocate the use of acoustic alarms as a means of protecting the harbor porpoise population. Irrelevant - the opinion of Environmentalists does not matter

D. The alarms were installed at the time of year when harbor porpoises are most plentiful in the Massachusetts waters. Incorrect - the quantity does not matter as long as the alarms are saving the lives the porpoises .Also , even if we negate this , the alarms were installed at the time of year when porpoise population was below the peak , the alarms might still help in saving lives .

E. The cost of installing acoustic alarms on fishing boats is less than the cost of repairing nets damaged by harbor porpoises. Irrelevant

Answer B


D also contradicts the question stem's use of "average" when describing the number saved.
Manager
Manager
Joined: 03 Dec 2018
Posts: 132
Own Kudos [?]: 18 [0]
Given Kudos: 93
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
Negation of B directly destroys the cocnlusion. But how to eliminate option D?

The conclusion is based on the premise that propoises caught has dropped from 8 to 1. What if the alarms were insatalled when the propoises were not plentiful and the number drop is due to less propoises.

Please explain why D is wrong?
Intern
Intern
Joined: 22 Sep 2018
Posts: 49
Own Kudos [?]: 47 [0]
Given Kudos: 44
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
Could someone help to explain B is an assumption we have to consider? Why is the 'disoriented' in option B mean? This confused me. I do understand if the purpoises are not more likely to be killed by other boats, then we can confirm that the alarms actually do save the lives of harbor purposes. Please help to clarify this doubt. Thanks.
GMAT Club Legend
GMAT Club Legend
Joined: 15 Jul 2015
Posts: 5201
Own Kudos [?]: 4685 [4]
Given Kudos: 639
Location: India
GMAT Focus 1:
715 Q83 V90 DI83
GMAT 1: 780 Q50 V51
GRE 1: Q170 V169
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
2
Kudos
2
Bookmarks
Expert Reply
Leonaann wrote:
Could someone help to explain B is an assumption we have to consider? Why is the 'disoriented' in option B mean? This confused me. I do understand if the purpoises are not more likely to be killed by other boats, then we can confirm that the alarms actually do save the lives of harbor purposes. Please help to clarify this doubt. Thanks.
The support is ~"the company's plan (alarms) helped to reduce the number of porpoises killed by its (the company's) boats". The conclusion is that the company's plan is "saving the lives of harbor porpoises in those waters".

There is a clear "gap" here between the number of porpoises killed by the company's boats and the number of porpoises dying "in those waters": what if the company's plan causes something to happen that makes the porpoises significantly more likely to be killed by some other means? In that case, even if the company's own boats don't kill as many porpoises as they used to, the company's plan will end up leading to the deaths of many more porpoises. That's what option B addresses. It says that the probability that harbor porpoises will be killed in some other way is not high, and therefore the net impact of the company's plan is likely to be positive.

The "disoriented" bit just describes the effect on the porpoises of the alarms that the company installed on its boats ("the sound emitted temporarily disorients the porpoises").
GMAT Club Verbal Expert
Joined: 13 Aug 2009
Status: GMAT/GRE/LSAT tutors
Posts: 6936
Own Kudos [?]: 63985 [2]
Given Kudos: 1794
Location: United States (CO)
GMAT 1: 780 Q51 V46
GMAT 2: 800 Q51 V51
GRE 1: Q170 V170

GRE 2: Q170 V170
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
2
Bookmarks
Expert Reply
mallya12 wrote:
Negation of B directly destroys the cocnlusion. But how to eliminate option D?

The conclusion is based on the premise that propoises caught has dropped from 8 to 1. What if the alarms were insatalled when the propoises were not plentiful and the number drop is due to less propoises.

Please explain why D is wrong?

The question asks "Which [answer choice] is an assumption on which the argument depends." So, we are looking for an answer choice that MUST be true in order for the author to reach his/her conclusion.

The conclusion is that "The alarms... are saving the lives of harbor porpoises in those waters."

Evidence for this conclusion is that "since the installation of the alarms, the average number of porpoises caught in the company's nets has dropped from eight to one per month."

With this in mind, take another look at (D):
Quote:
(D) The alarms were installed at the time of year when harbor porpoises are most plentiful in the Massachusetts waters.

Does this absolutely have to be true in order for the author to reach his/her conclusion?

Think through the argument if the author does not assume that the nets were installed during the time of year when porpoises are most plentiful. Perhaps the alarms were installed when the population was low, and then a bunch of porpoises arrived in the months after. This would strengthen the evidence in the passage, because the number of porpoises caught in nets has decreased despite the overall population increasing. Because the argument does not fall apart if (D) is not assumed, (D) is not an argument on which the argument depends.

Note: this hypothetical situation is sufficient to eliminate (D), but you could think of many additional cases in which this answer choice impacts the conclusion in different ways.

Let's say that the alarms were installed at the time of year when porpoises are most plentiful -- what does that do to the conclusion? It depends on several additional factors. Maybe a huge majority of the porpoises left the Massachusetts waters immediately after the alarms were installed, so the number getting caught in the company's nets would decrease with or without the influence of the alarms. This would weaken the author's conclusion. Maybe the large number of porpoises did stick around -- if this were the case, the evidence in the passage would not be affected.

Overall, we cannot say how the information in (D) impacts the author's conclusion, so it is definitely not an assumption on which the argument depends.

I hope that helps!
Senior Manager
Senior Manager
Joined: 05 Jan 2019
Posts: 472
Own Kudos [?]: 346 [0]
Given Kudos: 28
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
Type: Find the assumption

Conclusion: The alarms, therefore, are saving the lives of harbor porpoises in those waters.


(A) The use of acoustic alarms increases the number of commercial fish caught by the fishing company's boats.
- irrelevant to the conclusion.

(B) When disoriented, harbor porpoises are not significantly more likely to be killed by other boats. - if this were true, then we can infer that the disorientation caused by the ''alarms'' do not endanger the porpoises. However, if the disorientation caused by these alarms puts these porpoises at direct risk, then we no longer can support the conclusion drawn. Hence, we need to assume (B) in order for the conclusion to hold. Therefore, (B) is the right answer choice.

(C) Environmentalists advocate the use of acoustic alarms as a means of protecting the harbor porpoise population.
- has no bearing on the conclusion.

(D) The alarms were installed at the time of year when harbor porpoises are most plentiful in the Massachusetts waters.
- irrelevant.

(E) The cost of installing acoustic alarms on fishing boats is less than the cost of repairing nets damaged by harbor porpoises.
- irrelevant.
Intern
Intern
Joined: 27 Nov 2014
Posts: 27
Own Kudos [?]: 20 [0]
Given Kudos: 83
Location: India
Concentration: International Business, General Management
GMAT 1: 360 Q27 V14
GMAT 2: 430 Q30 V20
GMAT 3: 480 Q36 V20
GPA: 3.78
WE:Engineering (Transportation)
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
GMAT experts.. Please help.. How B is correct and not D???
Intern
Intern
Joined: 15 May 2020
Posts: 11
Own Kudos [?]: 2 [0]
Given Kudos: 65
Location: United Kingdom
GPA: 4
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
commandos1985 wrote:
To prevent harbor porpoises from getting tangled in its nets and suffocating, a fishing company installed acoustic alarms on all its boats that fish in waters off Massachusetts. The sound emitted temporarily disorients the porpoises and frightens them away. Since the installation of the alarms, the average number of porpoises caught in the company's nets has dropped from eight to one per month. The alarms, therefore, are saving the lives of harbor porpoises in those waters.

Which of the following is an assumption on which the argument depends?


(A) The use of acoustic alarms increases the number of commercial fish caught by the fishing company's boats.

(B) When disoriented, harbor porpoises are not significantly more likely to be killed by other boats.

(C) Environmentalists advocate the use of acoustic alarms as a means of protecting the harbor porpoise population.

(D) The alarms were installed at the time of year when harbor porpoises are most plentiful in the Massachusetts waters.

(E) The cost of installing acoustic alarms on fishing boats is less than the cost of repairing nets damaged by harbor porpoises.




A - it is out of scope assumption that doesn't influence the argument, and it has nothing to deal with the protection of porpoises.

B - This answer choice correctly provides the assumption that shows the main purpose on which the conclusion of such an argument is based. - Correct Answer

C- It's out of scope, we have nothing to do with environmentalists. Who cares what they think.

D- Also wrong, since it talks when the alarms are installed rather than why, and what it's the main purpose.

E - Out of scope as well, as this argument has nothing to deal with the cost of the alarm installation.
Board of Directors
Joined: 11 Jun 2011
Status:QA & VA Forum Moderator
Posts: 6067
Own Kudos [?]: 4707 [0]
Given Kudos: 463
Location: India
GPA: 3.5
WE:Business Development (Commercial Banking)
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
commandos1985 wrote:
To prevent harbor porpoises from getting tangled in its nets and suffocating, a fishing company installed acoustic alarms on all its boats that fish in waters off Massachusetts. The sound emitted temporarily disorients the porpoises and frightens them away. Since the installation of the alarms, the average number of porpoises caught in the company's nets has dropped from eight to one per month. The alarms, therefore, are saving the lives of harbor porpoises in those waters.

Which of the following is an assumption on which the argument depends?


(A) The use of acoustic alarms increases the number of commercial fish caught by the fishing company's boats.

(B) When disoriented, harbor porpoises are not significantly more likely to be killed by other boats.

(C) Environmentalists advocate the use of acoustic alarms as a means of protecting the harbor porpoise population.

(D) The alarms were installed at the time of year when harbor porpoises are most plentiful in the Massachusetts waters.

(E) The cost of installing acoustic alarms on fishing boats is less than the cost of repairing nets damaged by harbor porpoises.

The main concern about the porpoises is to protect them (May be they are endangered or some other concerns which is out of scope of dicussion)

Now between (B) and (D)

(B) If yes alarm disorients harbor porpoises and they move far away they are saved , if no then the objective of saving the harbor porpoises.

Thus, Option (B) must be a necessary condition and is necessary to achieve the conclusion highlighted in blue.

(D) If yes alarms were installed when fish population is high and yet they are not trapped in fishing net - Its is successful

but if they were not installed at a time when harbor porpoises population was not high then it will not be correct to reach the conclusion...

Hence (B) looks a better Answer compared to (D)
Manager
Manager
Joined: 11 Apr 2020
Posts: 126
Own Kudos [?]: 239 [0]
Given Kudos: 630
GMAT 1: 660 Q49 V31
Send PM
Re: To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
Conclusion:
The alarms, therefore, are saving the lives of harbor porpoises in those waters.

Just negate option B
(B) When disoriented, harbor porpoises are not significantly more likely to be killed by other boats.

Totally breaks the conclusion

Hence option (B) is correct
Director
Director
Joined: 17 Aug 2009
Posts: 669
Own Kudos [?]: 41 [0]
Given Kudos: 26
Send PM
To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
Understanding the argument -
To prevent harbor porpoises from getting tangled in its nets and suffocating, a fishing company installed acoustic alarms on all its boats that fish in waters off Massachusetts. Fact
The sound emitted temporarily disorients the porpoises and frightens them away. Fact
Since the installation of the alarms, the average number of porpoises caught in the company's nets has dropped from eight to one per month. - Fact
The alarms, therefore, are saving the lives of harbor porpoises in those waters. - Conclusion

We need an assumption or a missing premise or necessary information for the conclusion: "The alarms are saving the lives of harbor porpoises."

(A) The use of acoustic alarms increases the number of commercial fish caught by the fishing company's boats. - How does it even relate to the scope of the conclusion, which is "The alarms are saving the lives of harbor porpoises"? Out of scope.

(B) When disoriented, harbor porpoises are not significantly more likely to be killed by other boats. - ok.

(C) Environmentalists advocate the use of acoustic alarms as a means of protecting the harbor porpoise population. - How does "environmentalists advocate" link to the scope of the argument, which is finding a necessary condition or missing premise for the conclusion to hold: "The alarms are saving the lives of harbor porpoises." Distortion.

(D) The alarms were installed at the time of year when harbor porpoises are most plentiful in the Massachusetts waters. - What does timing have to do with the scope of the argument? If the alarms were installed when the population of porpoises was at its peak, it positively correlated with the installation and reduction in porpoise entanglement. However, the absence of this information doesn't impact the cause-and-effect relationship between alarms and the reduced porpoise entanglement, which is crucial for the argument's validity. Therefore, while timing could be interesting, it doesn't directly address the cause-effect relationship needed to support the conclusion that the alarms are saving porpoise lives.

Or Let's take a logical negation of this option: The alarms were not installed at the time of the year when harbor porpoises are most plentiful in Massachusetts waters. The conclusion can still be valid. Isnt it? So, this must be something other than our assumption. At best, it's a strengthener. But we are looking for an assumption that is a minimum condition or must be true for the conclusion to hold. As we saw here, the conclusion still holds when we negate it. This is not our assumption.

(E) The cost of installing acoustic alarms on fishing boats is less than the cost of repairing nets damaged by harbor porpoises. - out of scope.
GMAT Club Bot
To prevent harbor porpoises from getting tangled in its nets and suffo [#permalink]
Moderators:
GMAT Club Verbal Expert
6936 posts
GMAT Club Verbal Expert
238 posts
CR Forum Moderator
832 posts