It is currently 18 Oct 2017, 06:30

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

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

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Studies have shown that an automobile that runs on a blend

Author Message
TAGS:

Hide Tags

Verbal Forum Moderator
Joined: 23 Oct 2011
Posts: 280

Kudos [?]: 962 [0], given: 23

Studies have shown that an automobile that runs on a blend [#permalink]

Show Tags

28 Apr 2012, 20:47
1
This post was
BOOKMARKED
00:00

Difficulty:

15% (low)

Question Stats:

76% (00:57) correct 24% (01:09) wrong based on 425 sessions

HideShow timer Statistics

Studies have shown that an automobile that runs on a blend of 85% ethanol/15% gasoline
gets better mileage than an otherwise similar car equipped with a gasoline engine. Many
American legislators have concluded that an increase in tax incentives for ethanol production
would lessen our dependence on foreign oil. Which of the following, if true, casts the most
doubt upon the validity of the legislators’ conclusion?
A) It takes 1.5 gallons of oil to produce 1 gallon of ethanol.
b) Electric cars are cheaper to operate than cars running on the ethanol fuel mix.
c) It costs thousands of dollars to retrofit an automobile to run on the ethanol fuel mix.
d) The ethanol/gasoline blend emits more pollution that regular gasoline.
e) The ethanol/gasoline blend has not been widely adopted in Europe.

[Reveal] Spoiler: OA

_________________

********************
Push +1 kudos button please, if you like my post.

Last edited by GetThisDone on 28 Apr 2012, 20:57, edited 1 time in total.

Kudos [?]: 962 [0], given: 23

Manager
Joined: 22 Feb 2009
Posts: 213

Kudos [?]: 173 [2], given: 148

Re: Studies have shown that an automobile [#permalink]

Show Tags

03 Aug 2014, 02:32
2
KUDOS
tuanquang269 wrote:
This is my new project: Renew Old Thread => Back to basic => Just try It and give your reasoning
The topic will be sticky for 2 days from starting

Studies have shown that an automobile that runs on a blend of 85% ethanol/15% gasoline gets better mileage than an otherwise similar car equipped with a gasoline engine. Many American legislators have concluded that an increase in tax incentives for ethanol production would lessen our dependence on foreign oil.

Which of the following, if true, casts the most doubt upon the validity of the legislators’ conclusion?

A) It takes 1.5 gallons of oil to produce 1 gallon of ethanol.
b) Electric cars are cheaper to operate than cars running on the ethanol fuel mix.
c) It costs thousands of dollars to retrofit an automobile to run on the ethanol fuel mix.
d) The ethanol/gasoline blend emits more pollution that regular gasoline.
e) The ethanol/gasoline blend has not been widely adopted in Europe.

We need something that says: an increase in tax incentives for ethanol production would not lessen our dependence on foreign oil. For A , if this is the case, then we need more oil to produce ethanol, the depend on foreign oil will not be lessen.
_________________

.........................................................................
+1 Kudos please, if you like my post

Kudos [?]: 173 [2], given: 148

Manager
Joined: 27 Jul 2012
Posts: 126

Kudos [?]: 94 [1], given: 101

Re: Studies have shown that an automobile [#permalink]

Show Tags

02 Aug 2014, 01:14
1
KUDOS
with using automobiles that run on a blend of 85% ethanol/15% gasoline the dependence on foreign oil will lessen.
to weaken this reasoning we should choose and option that indicates with using this blended fuel, the usage of oil will not decrease.
option A does the same.
it shows that for producing 1 liter of ethanol, 1.5 liter of oil is needed. therefore, producing ethanol in fact increases the dependency on oil.

Kudos [?]: 94 [1], given: 101

MBA Section Director
Joined: 19 Mar 2012
Posts: 4473

Kudos [?]: 16971 [1], given: 1961

Location: India
GMAT 1: 760 Q50 V42
GPA: 3.8
WE: Marketing (Energy and Utilities)
Weaken Revision: Studies have shown that an automobile that [#permalink]

Show Tags

18 Feb 2015, 22:59
1
KUDOS
Expert's post
1
This post was
BOOKMARKED
This question is part of the GMAT Club Critical Reasoning: "Weaken an argument" revision Project.

Studies have shown that an automobile that runs on a blend of 85% ethanol/15% gasoline gets better mileage than an otherwise similar car equipped with a gasoline engine. Many American legislators have concluded that an increase in tax incentives for ethanol production would lessen our dependence on foreign oil. Which of the following, if true, casts the most doubt upon the validity of the legislators’ conclusion?

A. It takes 1.5 gallons of oil to produce 1 gallon of ethanol.

B. Electric cars are cheaper to operate than cars running on the ethanol fuel mix.

C. It costs thousands of dollars to retrofit an automobile to run on the ethanol fuel mix.

D. The ethanol/gasoline blend emits more pollution that regular gasoline.

E. The ethanol/gasoline blend has not been widely adopted in Europe.
_________________

Kudos [?]: 16971 [1], given: 1961

Retired Moderator
Status: 2000 posts! I don't know whether I should feel great or sad about it! LOL
Joined: 04 Oct 2009
Posts: 1635

Kudos [?]: 1105 [0], given: 109

Location: Peru
Schools: Harvard, Stanford, Wharton, MIT & HKS (Government)
WE 1: Economic research
WE 2: Banking
WE 3: Government: Foreign Trade and SMEs
Re: CR - Weaken - # 3 [#permalink]

Show Tags

28 Apr 2012, 20:53
+1 A

Producing ethanol requires that we have to buy gasoline.
Also, the galon of gasoline that we won't use directly in our cars, it will be used in the production. But there is more! We will have to buy an additional 0.5 galon of gasoline to produce the ethanol.

_________________

"Life’s battle doesn’t always go to stronger or faster men; but sooner or later the man who wins is the one who thinks he can."

My Integrated Reasoning Logbook / Diary: http://gmatclub.com/forum/my-ir-logbook-diary-133264.html

GMAT Club Premium Membership - big benefits and savings

Kudos [?]: 1105 [0], given: 109

Manager
Joined: 03 Aug 2011
Posts: 54

Kudos [?]: 5 [0], given: 3

Re: CR - Weaken - # 3 [#permalink]

Show Tags

29 Apr 2012, 02:55
It came down to between A and C;

I chose A over C.

A -> If it takes 1.5 gallons of gasoline to produce 1 gallon of ethanol, then it still mean we have to continue importing gasoline ----> Weakens

C-> Even if we know that replacing the engines would be costly, we do not know if that would keep the customers from replacing the engines and continue importing Gasoline.

Kudos [?]: 5 [0], given: 3

Manager
Status: Trying.... & desperate for success.
Joined: 17 May 2012
Posts: 73

Kudos [?]: 106 [0], given: 61

Location: India
Schools: NUS '15
GPA: 2.92
WE: Analyst (Computer Software)
Re: Studies have shown that an automobile that runs on a blend [#permalink]

Show Tags

06 Sep 2012, 11:17
GetThisDone wrote:
Studies have shown that an automobile that runs on a blend of 85% ethanol/15% gasoline
gets better mileage than an otherwise similar car equipped with a gasoline engine. Many
American legislators have concluded that an increase in tax incentives for ethanol production
would lessen our dependence on foreign oil. Which of the following, if true, casts the most
doubt upon the validity of the legislators’ conclusion?
A) It takes 1.5 gallons of oil to produce 1 gallon of ethanol.
b) Electric cars are cheaper to operate than cars running on the ethanol fuel mix.
c) It costs thousands of dollars to retrofit an automobile to run on the ethanol fuel mix.
d) The ethanol/gasoline blend emits more pollution that regular gasoline.
e) The ethanol/gasoline blend has not been widely adopted in Europe.

Again, another ambiguious question.
If one is narrowing to option A, how would one know that it would take relatively lesser gallons of oil to produce gasoline than ethanol?
& for C, we still don't know the cost to benefit ratio here to asertain that it weakens.

I'm Confused.

Kudos [?]: 106 [0], given: 61

Manager
Joined: 30 Sep 2009
Posts: 116

Kudos [?]: 34 [0], given: 183

Re: Studies have shown that an automobile that runs on a blend [#permalink]

Show Tags

06 Sep 2012, 18:58
navigator123 wrote:
GetThisDone wrote:
Studies have shown that an automobile that runs on a blend of 85% ethanol/15% gasoline
gets better mileage than an otherwise similar car equipped with a gasoline engine. Many
American legislators have concluded that an increase in tax incentives for ethanol production
would lessen our dependence on foreign oil. Which of the following, if true, casts the most
doubt upon the validity of the legislators’ conclusion?
A) It takes 1.5 gallons of oil to produce 1 gallon of ethanol.
b) Electric cars are cheaper to operate than cars running on the ethanol fuel mix.
c) It costs thousands of dollars to retrofit an automobile to run on the ethanol fuel mix.
d) The ethanol/gasoline blend emits more pollution that regular gasoline.
e) The ethanol/gasoline blend has not been widely adopted in Europe.

Again, another ambiguious question.
If one is narrowing to option A, how would one know that it would take relatively lesser gallons of oil to produce gasoline than ethanol?
& for C, we still don't know the cost to benefit ratio here to asertain that it weakens.

I'm Confused.

the question here is --> Which of the following, if true, casts the most doubt upon the validity of the legislators’ conclusion?

Legislator's conclusion : we can reduce the dependency of foreign oil ... the cost of oil and other stuffs is not discussed in the conclusion

C does not tell anything about the legislator's conclusion while A does... If to create 1 gallon of ethanol we use 1.5 gallon of oil .. the dependency of oil is still there ....

Kudos [?]: 34 [0], given: 183

Manager
Joined: 14 Nov 2008
Posts: 68

Kudos [?]: 26 [0], given: 1

Re: Studies have shown that an automobile that runs on a blend [#permalink]

Show Tags

01 Sep 2013, 11:39
The legislators want to promote ethanol production in order to lessen our
dependence on foreign oil. Any evidence that ethanol production would not
lessen our dependence on foreign oil would undermine the legislators'
conclusion.
(A) CORRECT. If it takes 1.5 gallons of oil to make 1 gallon of ethanol, it is not
clear that producing ethanol can help us to reduce our reliance on foreign oil.
(B) As long as many drivers prefer not to switch to electric cars, it is possible that
the ethanol fuel mix will come into widespread use.
(C) Although it may be expensive to retrofit a non-ethanol vehicle, ethanol-ready
new vehicles might constitute a large potential market for subsidized ethanol.
(D) This answer choice is irrelevant because the argument does not mention
pollution.
(E) Without any information as to why the ethanol/gasoline blend has not been
widely adopted in Europe, we cannot reach any conclusions that are relevant to
the United States.

Kudos [?]: 26 [0], given: 1

BSchool Forum Moderator
Status: Flying over the cloud!
Joined: 17 Aug 2011
Posts: 888

Kudos [?]: 718 [0], given: 44

Location: Viet Nam
GMAT Date: 06-06-2014
GPA: 3.07
Studies have shown that an automobile [#permalink]

Show Tags

01 Aug 2014, 19:12
1
This post was
BOOKMARKED
This is my new project: Renew Old Thread => Back to basic => Just try It and give your reasoning
The topic will be sticky for 2 days from starting

Studies have shown that an automobile that runs on a blend of 85% ethanol/15% gasoline gets better mileage than an otherwise similar car equipped with a gasoline engine. Many American legislators have concluded that an increase in tax incentives for ethanol production would lessen our dependence on foreign oil.

Which of the following, if true, casts the most doubt upon the validity of the legislators’ conclusion?

A) It takes 1.5 gallons of oil to produce 1 gallon of ethanol.
b) Electric cars are cheaper to operate than cars running on the ethanol fuel mix.
c) It costs thousands of dollars to retrofit an automobile to run on the ethanol fuel mix.
d) The ethanol/gasoline blend emits more pollution that regular gasoline.
e) The ethanol/gasoline blend has not been widely adopted in Europe.
_________________

Rules for posting in verbal gmat forum, read it before posting anything in verbal forum
Giving me + 1 kudos if my post is valuable with you

The more you like my post, the more you share to other's need

CR: Focus of the Week: Must be True Question

Kudos [?]: 718 [0], given: 44

Senior Manager
Joined: 27 Oct 2013
Posts: 254

Kudos [?]: 128 [0], given: 79

Location: India
Concentration: General Management, Technology
GMAT Date: 03-02-2015
GPA: 3.88
Re: Weaken Revision: Studies have shown that an automobile that [#permalink]

Show Tags

19 Feb 2015, 01:35
Premise: a blend of 85% ethanol/15% gasoline gets better mileage than an otherwise similar car equipped with a gasoline engine
Conclusion: an increase in tax incentives for ethanol production would lessen our dependence on foreign oil.

A. It takes 1.5 gallons of oil to produce 1 gallon of ethanol.
--- Breaks the conclusion--> Hold it -----

B. Electric cars are cheaper to operate than cars running on the ethanol fuel mix.
--- Out of scope ---

C. It costs thousands of dollars to retrofit an automobile to run on the ethanol fuel mix.
---- It is not relevant, because there can be a chance that less dependence on foreign oil proves beneficial in longer run ---

D. The ethanol/gasoline blend emits more pollution that regular gasoline.
--- Out of scope ---

E. The ethanol/gasoline blend has not been widely adopted in Europe.
---- out of scope ----

Option A is correct

Kudos [?]: 128 [0], given: 79

Manager
Status: Manager
Affiliations: Manager
Joined: 06 Nov 2012
Posts: 168

Kudos [?]: 90 [0], given: 111

Location: India
Concentration: Entrepreneurship, Sustainability
Schools: Boston U '19 (D)
GMAT 1: 650 Q49 V29
GMAT 2: 680 Q49 V33
GPA: 3
WE: Supply Chain Management (Energy and Utilities)
Re: Weaken Revision: Studies have shown that an automobile that [#permalink]

Show Tags

19 Feb 2015, 02:07
Although my take is A but I chose least devil as I still have doubt with A.

A say: It takes 1.5 gallons of oil to produce 1 gallon of ethanol.

It is already mentioned that 85E/15G have better mileage that 100G. Then, consider the case when 1.5 gallons of oil run the car only 10miles but equivalent 1gallon Etahonol runs it 25miles or make it further simple.

85 ltr. Ethanol + 15 ltr Gasoline (100 ltr mix) = say 20 miles (better mileage already given)
100 ltr. Gasoline = say 10 miles.
Now, for producing 85 ltr. ethanol, it took 127.5 gallon gasoline.
Therefore, 127.5+ 15 = 142.5 ltr Gasoline mix runs 20 miles. However on other hand, 100ltr gasoline runs 10miles or 142.5ltr runs only 14.25miles. Therefore, it can still lessen dependence on foreign fuel.

Please explain or correct me if I am wrong in my reasoning..
_________________

Hard-work, Perseverance and Commitment.....

Kudos [?]: 90 [0], given: 111

Manager
Joined: 07 Feb 2015
Posts: 50

Kudos [?]: 22 [0], given: 76

Re: Weaken Revision: Studies have shown that an automobile that [#permalink]

Show Tags

19 Feb 2015, 07:39
IMO - (A)
B,C,D,E - they are more or less irrelevant to the conclusion .
As regards to (A)
heres the math , in producing 1 gallon of ethanol-gasoline mixture we need 1.425 gallons of oil. however it produces better mileage an we need to see how much oil is required per mile in comparison to conventional gasoline. But here is the problem, we are told "better mileage" we need a specific number on the mileage to carry out the math which we dont have. So the math really isnt needed in this one i guess
_________________

Kudos if it helped you in any way

Kudos [?]: 22 [0], given: 76

Manager
Joined: 30 Jul 2014
Posts: 137

Kudos [?]: 11 [0], given: 98

GPA: 3.72
Re: Weaken Revision: Studies have shown that an automobile that [#permalink]

Show Tags

12 Mar 2015, 06:36
Marked, C - as the cost benefits of Gasoline are being surpassed by the cost of refit of the engine. Later realised that I am wrong in giving precedence to C over A.
_________________

A lot needs to be learned from all of you.

Kudos [?]: 11 [0], given: 98

GMAT Club Legend
Joined: 01 Oct 2013
Posts: 10117

Kudos [?]: 261 [0], given: 0

Re: Studies have shown that an automobile [#permalink]

Show Tags

28 Mar 2016, 08:55
Hello from the GMAT Club VerbalBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.

Kudos [?]: 261 [0], given: 0

Director
Joined: 24 Nov 2015
Posts: 586

Kudos [?]: 36 [0], given: 231

Location: United States (LA)
Re: Weaken Revision: Studies have shown that an automobile that [#permalink]

Show Tags

09 Apr 2016, 13:02
options B,D and E are completely out of scope options.option C is irrelevant with respect to concerned topic.the correct answer is option A

Kudos [?]: 36 [0], given: 231

Math Forum Moderator
Status: Greatness begins beyond your comfort zone
Joined: 08 Dec 2013
Posts: 1524

Kudos [?]: 945 [0], given: 72

Location: India
Concentration: General Management, Strategy
GPA: 3.2
WE: Information Technology (Consulting)
Re: Weaken Revision: Studies have shown that an automobile that [#permalink]

Show Tags

01 Feb 2017, 22:17
Studies have shown that an automobile that runs on a blend of 85% ethanol/15% gasoline gets better mileage than an otherwise similar car equipped with a gasoline engine. Many Type - weaken

The legislators want to promote ethanol production in order to lessen our dependence on foreign oil. Any evidence that ethanol production would not lessen our dependence on foreign oil would undermine the legislators' conclusion.

A. It takes 1.5 gallons of oil to produce 1 gallon of ethanol. - CORRECT. If it takes 1.5 gallons of oil to make 1 gallon of ethanol, it is not clear that producing ethanol can help us to reduce our reliance on foreign oil.
B. Electric cars are cheaper to operate than cars running on the ethanol fuel mix. - As long as many drivers prefer not to switch to electric cars, it is possible that the ethanol fuel mix will come into widespread use.
C. It costs thousands of dollars to retrofit an automobile to run on the ethanol fuel mix. - Although it may be expensive to retrofit a non-ethanol vehicle, ethanol-ready new vehicles might constitute a large potential market for subsidized ethanol.
D. The ethanol/gasoline blend emits more pollution that regular gasoline. - This answer choice is irrelevant because the argument does not mention pollution.
E. The ethanol/gasoline blend has not been widely adopted in Europe. - Without any information as to why the ethanol/gasoline blend has not been widely adopted in Europe, we cannot reach any conclusions that are relevant to the United States.

_________________

When everything seems to be going against you, remember that the airplane takes off against the wind, not with it. - Henry Ford
The Moment You Think About Giving Up, Think Of The Reason Why You Held On So Long
+1 Kudos if you find this post helpful

Kudos [?]: 945 [0], given: 72

Director
Joined: 26 Oct 2016
Posts: 694

Kudos [?]: 179 [0], given: 855

Location: United States
Schools: HBS '19
GMAT 1: 770 Q51 V44
GPA: 4
WE: Education (Education)
Re: Studies have shown that an automobile that runs on a blend [#permalink]

Show Tags

13 Apr 2017, 13:11
Conclusion :- increase in tax incentives for ethanol production would lessen our dependence on foreign oil.
Weaken :- increase in tax incentives for ethanol production would not lessen our dependence on foreign oil.

(A) CORRECT. If it takes 1.5 gallons of oil to make 1 gallon of ethanol, it is not
clear that producing ethanol can help us to reduce our reliance on foreign oil.
(B) As long as many drivers prefer not to switch to electric cars, it is possible that
the ethanol fuel mix will come into widespread use.
(C) Although it may be expensive to retrofit a non-ethanol vehicle, ethanol-ready
new vehicles might constitute a large potential market for subsidized ethanol.
(D) This answer choice is irrelevant because the argument does not mention
pollution.
(E) Without any information as to why the ethanol/gasoline blend has not been
widely adopted in Europe, we cannot reach any conclusions that are relevant to
the United States.
_________________

Thanks & Regards,
Anaira Mitch

Kudos [?]: 179 [0], given: 855

Director
Joined: 13 Feb 2015
Posts: 821

Kudos [?]: 8 [0], given: 32

Re: Studies have shown that an automobile that runs on a blend [#permalink]

Show Tags

28 Jun 2017, 04:22
Merged topics. Please, search before posting questions!
_________________

Kudos [?]: 8 [0], given: 32

Re: Studies have shown that an automobile that runs on a blend   [#permalink] 28 Jun 2017, 04:22
Display posts from previous: Sort by