Find all School-related info fast with the new School-Specific MBA Forum

It is currently 20 Sep 2014, 16:35

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

Leachate is a solution, frequently highly contaminated, that

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
SVP
SVP
avatar
Joined: 28 Dec 2005
Posts: 1593
Followers: 2

Kudos [?]: 73 [0], given: 2

GMAT Tests User
Leachate is a solution, frequently highly contaminated, that [#permalink] New post 03 Feb 2008, 20:15
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

38% (02:14) correct 62% (01:42) wrong based on 20 sessions
Leachate is a solution, frequently highly contaminated, that develops when water permeates a landfill site. If and only if the landfill’s capacity to hold liquids is exceeded does the leachate escape into the environment, generally in unpredictable quantities. A method must be found for disposing of leachate. Most landfill leachate is send directly to sewage treatment plants, but not all sewage plants are capable of handling the highly contaminated water.

Which one of the following can be inferred from the passage?
(A) The ability to predict the volume of escaping landfill leachate would help solve the disposal problem.
(B) If any water permeates a landfill, leachate will escape into the environment.
(C) No sewage treatment plants are capable of handling leachate.
(D) Some landfill leachate is sent to sewage treatment plants that are incapable of handling it.
(E) If leachate does not escape from a landfill into the environment, then the landfill’s capacity to hold liquids has not been exceeded.

I dont have an OA/OE for this, but thought Id put it up for discussion amongst our great community here.
Manager
Manager
User avatar
Joined: 02 Jan 2008
Posts: 159
Followers: 2

Kudos [?]: 57 [0], given: 0

Re: CR: Leachate [#permalink] New post 04 Feb 2008, 08:40
E

IF X then Y => If NOT Y then NOT X
Manager
Manager
User avatar
Joined: 02 Jan 2008
Posts: 196
Location: Toronto
Followers: 1

Kudos [?]: 29 [0], given: 0

GMAT Tests User
Re: CR: Leachate [#permalink] New post 04 Feb 2008, 08:59
E.

(A) The ability to predict the volume of escaping landfill leachate would help solve the disposal problem.
NO. There is no mention about this.

(B) If any water permeates a landfill, leachate will escape into the environment.
NO. Leachate will only escapes if it exceeds the holding capacity of the landfil.

(C) No sewage treatment plants are capable of handling leachate.
NO. Seems extreme statement ( but not all sewage plants are capable of handling the highly contaminated water.)

(D) Some landfill leachate is send to sewage treatment plants that are incapable of handling it.
NO. (Some instead of 'MOST')

(E) If leachate does not escape from a landfill into the environment, then the landfill’s capacity to hold liquids has not been exceeded.
YES, (If and only if the landfill’s capacity to hold liquids is exceeded does the leachate escape)
Expert Post
CEO
CEO
User avatar
Joined: 17 Nov 2007
Posts: 3571
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 364

Kudos [?]: 1795 [0], given: 358

GMAT ToolKit User GMAT Tests User Premium Member
Re: CR: Leachate [#permalink] New post 04 Feb 2008, 09:08
Expert's post
D

Leachate is a solution, frequently highly contaminated, that develops when water permeates a landfill site. If and only if the landfill’s capacity to hold liquids is exceeded does the leachate escape into the environment, generally in unpredictable quantities. A method must be found for disposing of leachate. Most landfill leachate is send directly to sewage treatment plants, but not all sewage plants are capable of handling the highly contaminated water.

The main idea: There is a problem: we cannot fully protect environment from highly contaminated leachate.

Which one of the following can be inferred from the passage?

(A) The ability to predict the volume of escaping landfill leachate would help solve the disposal problem. - extra information.
(B) If any water permeates a landfill, leachate will escape into the environment. - is not true.
(C) No sewage treatment plants are capable of handling leachate. - is not true.
(D) Some landfill leachate is send to sewage treatment plants that are incapable of handling it. - it is the problem discussed in the passage."Some landfill leachate" refers to "a solution frequently highly contaminated"
(E) If leachate does not escape from a landfill into the environment, then the landfill’s capacity to hold liquids has not been exceeded. - too particular information. Nothing about inability to treat dangerous leachate. we have inferred question rather than "must true" one.
_________________

HOT! GMAT TOOLKIT 2 (iOS) / GMAT TOOLKIT (Android) - The OFFICIAL GMAT CLUB PREP APP, a must-have app especially if you aim at 700+ | PrepGame

Manager
Manager
User avatar
Joined: 02 Feb 2007
Posts: 120
Followers: 1

Kudos [?]: 10 [0], given: 0

Re: CR: Leachate [#permalink] New post 04 Feb 2008, 10:30
I am with you Walker. I think it's D also.



pmenon wrote:
Leachate is a solution, frequently highly contaminated, that develops when water permeates a landfill site. If and only if the landfill’s capacity to hold liquids is exceeded does the leachate escape into the environment, generally in unpredictable quantities. A method must be found for disposing of leachate. Most landfill leachate is send directly to sewage treatment plants, but not all sewage plants are capable of handling the highly contaminated water.

Which one of the following can be inferred from the passage?
(A) The ability to predict the volume of escaping landfill leachate would help solve the disposal problem.
shouldn't worry about predicting how much water escapes the landfill
(B) If any water permeates a landfill, leachate will escape into the environment.
irrelevant, it's testing the word "to permeate"
(C) No sewage treatment plants are capable of handling leachate. irrelevant
(D) Some landfill leachate is send to sewage treatment plants that are incapable of handling it.
this is exactly what the last sentence of the passage is saying
(E) If leachate does not escape from a landfill into the environment, then the landfill’s capacity to hold liquids has not been exceeded. this is saying that is the toxic substance does not escape the environment, then the environment that hold the water is not full yet. it means that it's waiting for the water to overflow.

I dont have an OA/OE for this, but thought Id put it up for discussion amongst our great community here.
SVP
SVP
avatar
Joined: 16 Jul 2009
Posts: 1634
Schools: CBS
WE 1: 4 years (Consulting)
Followers: 31

Kudos [?]: 242 [0], given: 2

GMAT Tests User
Re: CR: Leachate [#permalink] New post 15 May 2010, 06:48
It is between D and E...
_________________

The sky is the limit
800 is the limit


Get the best GMAT Prep Resources with GMAT Club Premium Membership

Manager
Manager
avatar
Joined: 14 Apr 2010
Posts: 230
Followers: 2

Kudos [?]: 24 [0], given: 1

GMAT Tests User
Re: CR: Leachate [#permalink] New post 30 Jun 2010, 17:51
E for me.
SVP
SVP
avatar
Joined: 16 Jul 2009
Posts: 1634
Schools: CBS
WE 1: 4 years (Consulting)
Followers: 31

Kudos [?]: 242 [0], given: 2

GMAT Tests User
Re: CR: Leachate [#permalink] New post 01 Jul 2010, 01:24
OA is E.
Could anybody clarify why D is incorrect?
Thanks,
_________________

The sky is the limit
800 is the limit


Get the best GMAT Prep Resources with GMAT Club Premium Membership

Senior Manager
Senior Manager
User avatar
Joined: 25 Feb 2010
Posts: 459
Followers: 3

Kudos [?]: 35 [0], given: 5

GMAT Tests User
Re: CR: Leachate [#permalink] New post 01 Jul 2010, 07:08
noboru wrote:
OA is E.
Could anybody clarify why D is incorrect?
Thanks,



D is close, but as per question not all sewage plants are capable of handling contaminated water, this means that there is a probability that lechate goes to such a plant , while D suggests that it definitely goes to a few such plants, which may not be true.
_________________

GGG (Gym / GMAT / Girl) -- Be Serious

Its your duty to post OA afterwards; some one must be waiting for that...

VP
VP
avatar
Joined: 15 Jul 2004
Posts: 1474
Schools: Wharton (R2 - submitted); HBS (R2 - submitted); IIMA (admitted for 1 year PGPX)
Followers: 15

Kudos [?]: 98 [0], given: 13

GMAT Tests User
Re: CR: Leachate [#permalink] New post 01 Jul 2010, 08:49
E is a mere paraphrasing of the stimulus --- there is no inference per se here. I dont agree with OA. Also D which I think is right does not imply all sewage plants are incapable of handling leachate as one poster has commented. D says that some leachate goes is sent to sewage treatment plants THAT are incapable of handling it --- using SC knowledge - THAT is a restrictive modifier - so it is talking about THOSE sewage plants that cannot handle leachate. In fact if D had been worded such as - some leachate is sent to sewage treatment plants, WHICH are incapable of handling it --- then it COULD have indicated a possibility that the sewage treatment plants are incapable of handling it.
Manager
Manager
avatar
Joined: 24 Dec 2009
Posts: 227
Followers: 2

Kudos [?]: 25 [0], given: 3

GMAT Tests User
Re: CR: Leachate [#permalink] New post 01 Jul 2010, 09:13
(A) The ability to predict the volume of escaping landfill leachate would help solve the disposal problem.
-- New Inforamtion. Hence A can be eliminated.

(B) If any water permeates a landfill, leachate will escape into the environment.
-- Thats against the premise. Hence B cannot be the correct answer choice.

(C) No sewage treatment plants are capable of handling leachate.
Exaggerated answer choice. Hence C can be eliminated.

(D) Some landfill leachate is send to sewage treatment plants that are incapable of handling it.
This answer choice is like a shell game. Though it is possible, some leachate might be send to sewage treatment plants (incapable of handling), however it is not necessary that it has to be true. Hence we cannot infer this from the argument.

(E) If leachate does not escape from a landfill into the environment, then the landfill’s capacity to hold liquids has not been exceeded.
-- From the premise, we can clearly infer that it is true. Hence E has to be correct answer choice.

to resolve for answer choice D, you can use the venn diagram. Take the objects - leachate, sewage treatment, capable sewage treatment and see if the D comes true. It doesn't. Hence D is an incorrect answer choice.

Thank You.

Thanks,
Akhil M.Parekh
Expert Post
CEO
CEO
User avatar
Joined: 17 Nov 2007
Posts: 3571
Concentration: Entrepreneurship, Other
Schools: Chicago (Booth) - Class of 2011
GMAT 1: 750 Q50 V40
Followers: 364

Kudos [?]: 1795 [0], given: 358

GMAT ToolKit User GMAT Tests User Premium Member
Re: CR: Leachate [#permalink] New post 01 Jul 2010, 09:40
Expert's post
I was wrong more than two years ago. It's E.
_________________

HOT! GMAT TOOLKIT 2 (iOS) / GMAT TOOLKIT (Android) - The OFFICIAL GMAT CLUB PREP APP, a must-have app especially if you aim at 700+ | PrepGame

5 KUDOS received
Kaplan GMAT Instructor
User avatar
Joined: 21 Jun 2010
Posts: 75
Location: Toronto
Followers: 21

Kudos [?]: 104 [5] , given: 2

Re: CR: Leachate [#permalink] New post 01 Jul 2010, 10:31
5
This post received
KUDOS
Quote:
Could anybody clarify why D is incorrect?



Quote:
E is a mere paraphrasing of the stimulus --- there is no inference per se here.


Hi,

an inference is an implied conclusion. But on a GMAT inference question, if you see an answer choice that must be true based on the stimulus, you should always automaticlaly select it. There are two reasons for this: a) what you think is a simple paraphrase may actually have something new in it, and can thus be regarded as a proper inference; and b) some questions simply ask you to treat the passage as true, and select a choice that "must be true"--in these cases, the correct answer may even be a restatement of one of the statements in the passage.

In a GMAT inference question, a choice that must be true based on one or more statements in the passage is ALWAYS automatically correct.

Thus, the the four wrong answers are things that could be false.

Let's apply this approach to this question.

In the passage we learn that leachate gets into the environment if and only if the landfill’s capacity to hold liquids is exceeded. This means two things. First, whenever the landfill's capacity is exceeded, some leachate will definitely escape into the environment. Second, if the landfill's capacity is NOT exceeded, then there is nothing to worry about. (Formally, the landfill's capacity being exceeded is both a sufficient and necessary condition for leachate escaping into the environment).

Let's consider choices D and E:

(D) Some landfill leachate is send to sewage treatment plants that are incapable of handling it.

Well, I can see why this is tempting. After all, the last sentence told us that leachate (well, most of it anyways) is sent to sewage treatment plants, and that some sewage treatment plants can't handle leachate. But did we learn whether any leachate goes to the plants that can't hanlde it? Nope. Fine, there may be some plants that can't handle leachate, but it could easily be the case that no leachate is actually sent to these plants--that leachate is only sent to plants that CAN handle leachate.

Thus, choice D could be false, and we can eliminate it.

(E) If leachate does not escape from a landfill into the environment, then the landfill’s capacity to hold liquids has not been exceeded.

Well, we learned that if the landfill's capacity were exceeded that leachate will for sure escape into the environment. So, if no leachate escaped, then capacity was not exceeded (because if capacity were exceeded, leachate would have escaped!). (Many of you will recognize this concept as the "contrapositive").

Thus, choice E must be true (based on the passage). Thus, choice E must be correct.

TAKEWAY: in GMAT inference questions stay very CLOSE to the passage. If you see a choice that must be true, it is undoubtedly the correct answer. If you see a choice that could be false, it is undoubtedly an incorrect answer.

SOMETHING YOU SHOULD KNOW ABOUT THIS QUESTION: this is an LSAT or else an LSAT-like question. It tests formal logic in a way that GMAT CR never would.
_________________

Kaplan Teacher in Toronto
http://www.kaptest.com/GMAT

Prepare with Kaplan and save $150 on a course!

Image

Kaplan Reviews

VP
VP
avatar
Joined: 15 Jul 2004
Posts: 1474
Schools: Wharton (R2 - submitted); HBS (R2 - submitted); IIMA (admitted for 1 year PGPX)
Followers: 15

Kudos [?]: 98 [0], given: 13

GMAT Tests User
Re: CR: Leachate [#permalink] New post 01 Jul 2010, 11:18
Excellent! I am impressed - completely!

I missed the point that the leachates may after all NOT land up at any of the plants incapable of handling them! Gosh!

The other thing that threw me off and which I now remember is having failed to answer a similar question - albeit as I now recollect - was an assumption question - in which one of the (incorrect) answer choices was a paraphrase from the passage - and which I immediately jumped at and selected; turned out it was wrong. That kinda stayed in my memory and now when I saw this question that alarm went off again - because choice E sounded very much like a paraphrase and I felt it was a trap. It is a no brainer practically to see that E is true but well oh well... my bad...

Testluv wrote:
Quote:
Could anybody clarify why D is incorrect?



Quote:
E is a mere paraphrasing of the stimulus --- there is no inference per se here.


Hi,

an inference is an implied conclusion. But on a GMAT inference question, if you see an answer choice that must be true based on the stimulus, you should always automaticlaly select it. There are two reasons for this: a) what you think is a simple paraphrase may actually have something new in it, and can thus be regarded as a proper inference; and b) some questions simply ask you to treat the passage as true, and select a choice that "must be true"--in these cases, the correct answer may even be a restatement of one of the statements in the passage.

In a GMAT inference question, a choice that must be true based on one or more statements in the passage is ALWAYS automatically correct.

Thus, the the four wrong answers are things that could be false.

Let's apply this approach to this question.

In the passage we learn that leachate gets into the environment if and only if the landfill’s capacity to hold liquids is exceeded. This means two things. First, whenever the landfill's capacity is exceeded, some leachate will definitely escape into the environment. Second, if the landfill's capacity is NOT exceeded, then there is nothing to worry about. (Formally, the landfill's capacity being exceeded is both a sufficient and necessary condition for leachate escaping into the environment).

Let's consider choices D and E:

(D) Some landfill leachate is send to sewage treatment plants that are incapable of handling it.

Well, I can see why this is tempting. After all, the last sentence told us that leachate (well, most of it anyways) is sent to sewage treatment plants, and that some sewage treatment plants can't handle leachate. But did we learn whether any leachate goes to the plants that can't hanlde it? Nope. Fine, there may be some plants that can't handle leachate, but it could easily be the case that no leachate is actually sent to these plants--that leachate is only sent to plants that CAN handle leachate.

Thus, choice D could be false, and we can eliminate it.

(E) If leachate does not escape from a landfill into the environment, then the landfill’s capacity to hold liquids has not been exceeded.

Well, we learned that if the landfill's capacity were exceeded that leachate will for sure escape into the environment. So, if no leachate escaped, then capacity was not exceeded (because if capacity were exceeded, leachate would have escaped!). (Many of you will recognize this concept as the "contrapositive").

Thus, choice E must be true (based on the passage). Thus, choice E must be correct.

TAKEWAY: in GMAT inference questions stay very CLOSE to the passage. If you see a choice that must be true, it is undoubtedly the correct answer. If you see a choice that could be false, it is undoubtedly an incorrect answer.

SOMETHING YOU SHOULD KNOW ABOUT THIS QUESTION: this is an LSAT or else an LSAT-like question. It tests formal logic in a way that GMAT CR never would.
1 KUDOS received
Kaplan GMAT Instructor
User avatar
Joined: 21 Jun 2010
Posts: 75
Location: Toronto
Followers: 21

Kudos [?]: 104 [1] , given: 2

Re: CR: Leachate [#permalink] New post 01 Jul 2010, 13:46
1
This post received
KUDOS
Quote:
The other thing that threw me off and which I now remember is having failed to answer a similar question - albeit as I now recollect - was an assumption question - in which one of the (incorrect) answer choices was a paraphrase from the passage - and which I immediately jumped at and selected; turned out it was wrong. That kinda stayed in my memory and now when I saw this question that alarm went off again - because choice E sounded very much like a paraphrase and I felt it was a trap.


I'm glad you bring this up!

As discussed in my post above, in an inference or must be true type of question, a choice that restates or paraphrases a part of the passage is automatically correct.

However, in an assumption question, a choice that restates evidence is automatically wrong. Why? Because assumptions are, by definition, UNSTATED.

So, we can say:

In assumption questions, choices that restate evidence are automatically incorrect; in inference/must be true, choices that restate evidence are automatically correct.
_________________

Kaplan Teacher in Toronto
http://www.kaptest.com/GMAT

Prepare with Kaplan and save $150 on a course!

Image

Kaplan Reviews

VP
VP
avatar
Joined: 15 Jul 2004
Posts: 1474
Schools: Wharton (R2 - submitted); HBS (R2 - submitted); IIMA (admitted for 1 year PGPX)
Followers: 15

Kudos [?]: 98 [0], given: 13

GMAT Tests User
Re: CR: Leachate [#permalink] New post 01 Jul 2010, 13:50
Testluv wrote:
Quote:
In assumption questions, choices that restate evidence are automatically incorrect; in inference/must be true, choices that restate evidence are automatically correct.


That rule is an ideal candidate for a GMAT CR101 COURSE... perfect!
VP
VP
avatar
Joined: 15 Jul 2004
Posts: 1474
Schools: Wharton (R2 - submitted); HBS (R2 - submitted); IIMA (admitted for 1 year PGPX)
Followers: 15

Kudos [?]: 98 [0], given: 13

GMAT Tests User
Re: CR: Leachate [#permalink] New post 01 Jul 2010, 13:53
dwivedys wrote:
Testluv wrote:
Quote:
In assumption questions, choices that restate evidence are automatically incorrect; in inference/must be true, choices that restate evidence are automatically correct.


That rule is an ideal candidate for a GMAT CR101 COURSE... perfect!


of course we all know this fact - assumptions are unstated premises and inferences are siituations that MUST be true based on the passage...one gets the true import only after passing through the grind I must say... Well lesson learnt! Thanks a lot Testluv...you've got the knack to pinpoint the true pain areas... I truly appreciate it... You get my kudos...
1 KUDOS received
Kaplan GMAT Instructor
User avatar
Joined: 21 Jun 2010
Posts: 75
Location: Toronto
Followers: 21

Kudos [?]: 104 [1] , given: 2

Re: CR: Leachate [#permalink] New post 01 Jul 2010, 17:19
1
This post received
KUDOS
[quote2dwivedys]Well lesson learnt! Thanks a lot Testluv...you've got the knack to pinpoint the true pain areas... I truly appreciate it... You get my kudos...[/quote2]

Thanks so much for the kind words! :-D
_________________

Kaplan Teacher in Toronto
http://www.kaptest.com/GMAT

Prepare with Kaplan and save $150 on a course!

Image

Kaplan Reviews

Manager
Manager
avatar
Joined: 17 Oct 2008
Posts: 199
Followers: 1

Kudos [?]: 13 [0], given: 11

GMAT Tests User
Re: CR: Leachate [#permalink] New post 02 Jul 2010, 09:24
Marked E as well.(stick to basics)
D was really tempting though

great explanation by testluv. +1
Intern
Intern
avatar
Joined: 23 Jun 2010
Posts: 24
GMAT 1: 710 Q49 V37
Followers: 1

Kudos [?]: 2 [0], given: 24

GMAT ToolKit User
Re: CR: Leachate [#permalink] New post 31 Oct 2010, 02:12
Testluv wrote:
Quote:
Could anybody clarify why D is incorrect?

SOMETHING YOU SHOULD KNOW ABOUT THIS QUESTION: this is an LSAT or else an LSAT-like question. It tests formal logic in a way that GMAT CR never would.


Gr8 Explanation...+1 from my side..

As you said above that GMAT would never test these stuffs so is solving LSAT questions a bad idea to prepare for GMAT CR?
Re: CR: Leachate   [#permalink] 31 Oct 2010, 02:12
    Similar topics Author Replies Last post
Similar
Topics:
6 Leachate is a solution, frequently highly contaminated, that kingston 1 18 Jan 2013, 21:38
Leachate is a solutions, frequently highly contaminated, tenaman10 5 26 Jun 2009, 21:53
1 Experts publish their posts in the topic Leachate is a solution, frequently highly contaminated, that neelabhmahesh 5 05 Feb 2008, 04:27
2 Leachate is a solutions, frequently highly contaminated, asaf 12 06 Aug 2007, 13:02
Display posts from previous: Sort by

Leachate is a solution, frequently highly contaminated, that

  Question banks Downloads My Bookmarks Reviews Important topics  

Go to page    1   2    Next  [ 21 posts ] 



GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.