BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

OG Problem #57

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Senior | Next Rank: 100 Posts
Posts: 48
Joined: Sat Apr 03, 2010 8:35 pm
Thanked: 1 times
Followed by:1 members

OG Problem #57

by thp510 » Tue Feb 08, 2011 12:32 am
I was wondering if anyone can provide an explanation on why my reasoning is false?

Q57: If the county continues to collect residential trash at current levels, landfills will soon be overflowing and parkland will need to be used in order to create more space. Charging each household a fee for each pound of trash it puts out for collection will induce residents to reduce the amount of trash they create; this charge will therefore protect the remaining county parkland.
WHICH OF THE FOLLOWING IS AN ASSUMPTION MADE IN DRAWING THE CONCLUSION ABOVE?

A) Residents will reduce the amount of trash they put out for collection by reducing the number of products they buy.
B) The collection fee will not significantly affect the purchasing power of most residents, even if their households do not reduce the amount of trash they put out.
C) The collection fee will not induce residents to dump their trash in the parklands illegally.
D) The beauty of the county parkland is an important issue for most of the county's residents.
E) Landfills outside the county's borders could be used as dumping sites for the county's trash.


I choose A. Here's why.
Conl: Charge will protect the remaining county parkland.
premise 1: Current level cont, landfills will overflow. Parkland will be needed for space.
premise 2: Charging ea. HH a fee for each lb of trash it puts out for collection will induce residents to reduce the amount of trash they create.

Premise 1 + Premise 2 = Concl. Therefore, this sounds like "feasibility of premise" type assumption problem. Doesn't [spoiler](A)[/spoiler] explain premise 2? The official ANS is C, however, I initially crossed it off since I thought it sounded Out of Scope (illegal dumping?). Is Choice C just a better answer than A?

Thanks for the help. [/spoiler]
Top
Source: — Critical Reasoning |
User avatar
GMAT Instructor
Posts: 905
Joined: Sun Sep 12, 2010 1:38 am
Thanked: 378 times
Followed by:123 members
GMAT Score:760

by Geva@EconomistGMAT » Tue Feb 08, 2011 1:09 am
thp510 wrote:I was wondering if anyone can provide an explanation on why my reasoning is false?

Q57: If the county continues to collect residential trash at current levels, landfills will soon be overflowing and parkland will need to be used in order to create more space. Charging each household a fee for each pound of trash it puts out for collection will induce residents to reduce the amount of trash they create; this charge will therefore protect the remaining county parkland.
WHICH OF THE FOLLOWING IS AN ASSUMPTION MADE IN DRAWING THE CONCLUSION ABOVE?

A) Residents will reduce the amount of trash they put out for collection by reducing the number of products they buy.
B) The collection fee will not significantly affect the purchasing power of most residents, even if their households do not reduce the amount of trash they put out.
C) The collection fee will not induce residents to dump their trash in the parklands illegally.
D) The beauty of the county parkland is an important issue for most of the county's residents.
E) Landfills outside the county's borders could be used as dumping sites for the county's trash.

I choose A. Here's why.
Conl: Charge will protect the remaining county parkland.
premise 1: Current level cont, landfills will overflow. Parkland will be needed for space.
premise 2: Charging ea. HH a fee for each lb of trash it puts out for collection will induce residents to reduce the amount of trash they create.

Premise 1 + Premise 2 = Concl. Therefore, this sounds like "feasibility of premise" type assumption problem. Doesn't [spoiler](A)[/spoiler] explain premise 2? The official ANS is C, however, I initially crossed it off since I thought it sounded Out of Scope (illegal dumping?). Is Choice C just a better answer than A?

Thanks for the help. [/spoiler]
A is a possible assumption, but not a necessary assumption. when saying that imposing a fine will protect parklands, you are assuming that the fine somehow reduces trash production, but not an exact mechanism of how that works: the residents can reduce trash by buying less (answer choice A), or by burning their excess trash, or by shipping it to Yugoslavia, for all you know. Thus A is a possible assumption, but not a necessary assumption - I don't have to assume A in order to reach the conlclusion that the parks will be protected.

the same cannot be said about C: If C is not true, and people will dump their trash in the parklands to avoid the fine, then the fine will not protect the parklands, but rather the opposite. Therefore, C is a necessary assumption: in order to reach the conclusion that the fine will protect parkland, the author must assume that C is correct and the fine will NOT induce people to dump their trash on the lawn.
Geva
Senior Instructor
Master GMAT
1-888-780-GMAT
https://www.mastergmat.com
Top
User avatar
GMAT Instructor
Posts: 905
Joined: Sun Sep 12, 2010 1:38 am
Thanked: 378 times
Followed by:123 members
GMAT Score:760

by Geva@EconomistGMAT » Tue Feb 08, 2011 1:14 am
This question represents the harder subclass of assumption questions: the ones where the assumption is not just a link between the premises and the conclusion, but rather a necessary step: the position is that you CANNOT reach the conlcusion WITHOUT assuming C. The question you need to ask yourself when finishing the argument is "what must the author assume to reach his conclusion? If the author thinks that the fine will protect the parklands, he or she are assuming that the fine will achieve its goal of reducing trash. They must also assume that there is no harmful side effect to imposing the fine - that there's nothing stopping the fine from achieving its goal of reducing the amount of trash"

With this in mind, C suddenly makes perfect sense. The question is difficult precisely because it is very easy to label C as "out of scope" and eliminate it if you don't think about what the right answer should do before you go to the answer choices.
Geva
Senior Instructor
Master GMAT
1-888-780-GMAT
https://www.mastergmat.com
Top
Senior | Next Rank: 100 Posts
Posts: 48
Joined: Sat Apr 03, 2010 8:35 pm
Thanked: 1 times
Followed by:1 members

by thp510 » Tue Feb 08, 2011 2:31 am
Geva@MasterGMAT wrote:This question represents the harder subclass of assumption questions: the ones where the assumption is not just a link between the premises and the conclusion, but rather a necessary step: the position is that you CANNOT reach the conlcusion WITHOUT assuming C. The question you need to ask yourself when finishing the argument is "what must the author assume to reach his conclusion? If the author thinks that the fine will protect the parklands, he or she are assuming that the fine will achieve its goal of reducing trash. They must also assume that there is no harmful side effect to imposing the fine - that there's nothing stopping the fine from achieving its goal of reducing the amount of trash"

With this in mind, C suddenly makes perfect sense. The question is difficult precisely because it is very easy to label C as "out of scope" and eliminate it if you don't think about what the right answer should do before you go to the answer choices.
Awesome analysis. Thanks for the help!
Top
Post new topic Post Reply
• Page 1 of 1