Leachate is a solution, frequently highly contaminated, that : GMAT Critical Reasoning (CR)
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# Leachate is a solution, frequently highly contaminated, that

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Leachate is a solution, frequently highly contaminated, that [#permalink]

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05 Feb 2008, 04:27
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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 send 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.

Explanation pls.
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Neelabh Mahesh

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05 Feb 2008, 04:52
11-t59584
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05 Feb 2008, 05:09
walker wrote:
http://gmatclub.com/forum/11-t59584

Thanks Walker

But the answer is E. Is it by

If X then Y, If non Y then non X. But the argument says Y if and only if X.
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Neelabh Mahesh

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05 Feb 2008, 05:33
Ahh... I understood my mistake: 11-t50100
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06 Feb 2008, 21:18
(A) The ability to predict the volume of escaping landfill leachate would help solve the disposal problem.[Predicting the volume of escaping leachate implies landfills are exceeded liquid capacity – eliminate it]

(B) If any water permeates a landfill, leachate will escape into the environment.[Not really – If landfills are reached their full capacity, then we see this issue. – Eliminate it]

(C) No sewage treatment plants are capable of handling leachate.[The passages mentioned some plants – extreme choice – eliminate it]

(D) Some landfill leachate is send to sewage treatment plants that are incapable of handling it.[May be yes/no – passage some sewage treatment plants are incapable of treating leachate – 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. [Hold it – This is what passage mentioned]

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07 Feb 2008, 16:48
neelabhmahesh wrote:
walker wrote:
http://gmatclub.com/forum/11-t59584

Thanks Walker

But the answer is E. Is it by

If X then Y, If non Y then non X. But the argument says Y if and only if X.

I think "if and only if" works both ways. It implies both if X then Y and if Y then X. In the passage, the "if and only if" condition is given, so X implies Y and Y implies X. Option (E) is just one of the two (depending on what you define for X and Y).
Re: CR: Leachate   [#permalink] 07 Feb 2008, 16:48
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