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# It takes 4 weeks for a team of 5 professional Window Washers

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It takes 4 weeks for a team of 5 professional Window Washers [#permalink]

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19 Feb 2011, 14:05
1
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44% (02:08) correct 56% (01:24) wrong based on 125 sessions

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It takes 4 weeks for a team of 5 professional Window Washers working regular full time hours to completely clean every window of the Empire State building. The building's owner demands that all the windows always be clean.Yet even if the 5 washers work consistently throughout their regular work week,they will not be able to finish cleaning all the windows before some windows will need cleaning .

Which of the following statements as must be true on the basis of the statements above ?

A) If an empire state building window is to be kept clean, it must be cleaned by a professional cleaner.
B)The owner's demand for proper cleaning of all the windows will never be fulfilled.
C) If a team of 5 window washers cleans all the empire state building's windows in less than 4 weeks, some windows will not be properly cleaned.
D) In order to ensure that all of the Empire State Building's windows are clean, the owner must have his window washers work overtime.
E)Some Empire State Building windows must be cleaned more frequently than once every four weeks if they are to be kept clean.

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19 Feb 2011, 14:47
Looks like E to me, as some windows no longer remain clean within the 4 week period they need to finish cleaning
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19 Feb 2011, 16:46
2
KUDOS
A) If an empire state building window is to be kept clean, it must be cleaned by a professional cleaner.
--Too strong + Need not be true.
B)The owner's demand for proper cleaning of all the windows will never be fulfilled.
--Too strong..Need not be true. (he could hire more people/more efficient group.etc..)
C) If a team of 5 window washers cleans all the empire state building's windows in less than 4 weeks, some windows will not be properly cleaned.
--Quality of individual window cleaning is not discussed. Plus the group could work harder and clean all in 4 weeks.
D) In order to ensure that all of the Empire State Building's windows are clean, the owner must have his window washers work overtime.
--How do we know this? Maybe the workload still won't permit it.
E)Some Empire State Building windows must be cleaned more frequently than once every four weeks if they are to be kept clean.
--This is most plausible situation. The cleaning staff cleans every window in 4 weeks but the building is still not clean because "some windows need cleaning again". So some windows must get dirty before 4 weeks.
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19 Feb 2011, 17:48
E seems most reasonable..

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19 Feb 2011, 18:56
clean "C"
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19 Feb 2011, 18:59
Sorry. I think its not C. E stands out.

C may or may not be true.
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20 Feb 2011, 10:21
IMO, the ans is 'D'..

here's my opinion:

A) If an empire state building window is to be kept clean, it must be cleaned by a professional cleaner.
-- no where it's implied here..Hence, incorrect

B)The owner's demand for proper cleaning of all the windows will never be fulfilled.
--maybe if the owner uses more people, he would be able to meet the demand

C) If a team of 5 window washers cleans all the empire state building's windows in less than 4 weeks, some windows will not be properly cleaned.
--it maybe the fact the all windows are not properly cleaned. We are not discussing the quality of the work

D) In order to ensure that all of the Empire State Building's windows are clean, the owner must have his window washers work overtime.
--i think this is the correct ans from the start, the passage is time constant. i.e. 4 weeks, 5 workers, working hours...i think this is the correct ans.

E)Some Empire State Building windows must be cleaned more frequently than once every four weeks if they are to be kept clean.
--Nowhere its implied this..

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20 Feb 2011, 10:53
The most fatal word in D is "must". If D is true - you are assuming workers MUST work "overtime" What if the vendor increases the number of workers or uses more productive workers. D will fail.
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20 Feb 2011, 18:41
gmat1220 wrote:
The most fatal word in D is "must". If D is true - you are assuming workers MUST work "overtime" What if the vendor increases the number of workers or uses more productive workers. D will fail.

you're right..i missed that part. but i still fail to understand why E should be the right option? can you please explain?
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20 Feb 2011, 20:46
It takes 4 weeks for a team of 5 professional Window Washers working regular full time hours to completely clean every window of the Empire State building. The building's owner demands that all the windows always be clean.Yet even if the 5 washers work consistently throughout their regular work week,they will not be able to finish cleaning all the windows before some windows will need cleaning .

The preposition states that vendor is not efficient to complete the job in 4 weeks time with 5 pro workers. It means that lets say window A was cleaned sometime on Jan 1st. Then it will again require cleaning around Feb 1st. E is a paraphrase of the stimulus.

krishnasty wrote:
you're right..i missed that part. but i still fail to understand why E should be the right option? can you please explain?
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20 Feb 2011, 22:14
I too agree with ans E given the same reasons above ... However E seems pretty obvious to me which seems atypical of a level 700 question.. Unless the assumption that the windows are cleaned only once every 4 weeks under the current plan is debatable

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20 Feb 2011, 22:56
Thnx guys...

Its much clear from the exaplainations..
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21 Feb 2011, 01:50
OA is E. I've seen this one recently.
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21 Feb 2011, 02:21
I pick E

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21 Feb 2011, 04:00
It was a debate between D and E for me. But D is worded extremely and also introduces new info. In a Must Be True, correct answer should not bring in additional info.
So E is the correct answer.
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21 Feb 2011, 18:36
Definitely pick E.. what is OA?
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23 Feb 2011, 20:50
+1 E
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Re: It takes 4 weeks for a team of 5 professional Window Washers [#permalink]

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08 Nov 2011, 09:57
I like C for this one.
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Re: It takes 4 weeks for a team of 5 professional Window Washers [#permalink]

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08 Nov 2011, 10:11
It takes 4 weeks for a team of 5 professional Window Washers working regular full time hours to completely clean every window of the Empire State building. The building's owner demands that all the windows always be clean.Yet even if the 5 washers work consistently throughout their regular work week,they will not be able to finish cleaning all the windows before some windows will need cleaning .

This means some windows require cleaning in less than 4 weeks.

Which of the following statements as must be true on the basis of the statements above ?

A) If an empire state building window is to be kept clean, it must be cleaned by a professional cleaner.
B)The owner's demand for proper cleaning of all the windows will never be fulfilled.
C) If a team of 5 window washers cleans all the empire state building's windows in less than 4 weeks, some windows will not be properly cleaned.
D) In order to ensure that all of the Empire State Building's windows are clean, the owner must have his window washers work overtime.
E)Some Empire State Building windows must be cleaned more frequently than once every four weeks if they are to be kept clean.

Manager
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Re: It takes 4 weeks for a team of 5 professional Window Washers [#permalink]

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08 Nov 2011, 13:30
+1 for E.
As some widows will again be not clean when the workers finish all the windows in 4 weeks.
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CR notes
http://gmatclub.com/forum/massive-collection-of-verbal-questions-sc-rc-and-cr-106195.html#p832142
http://gmatclub.com/forum/1001-ds-questions-file-106193.html#p832133
http://gmatclub.com/forum/gmat-prep-critical-reasoning-collection-106783.html
http://gmatclub.com/forum/how-to-get-6-0-awa-my-guide-64327.html
http://gmatclub.com/forum/how-to-get-6-0-awa-my-guide-64327.html?hilit=chineseburned

Re: It takes 4 weeks for a team of 5 professional Window Washers   [#permalink] 08 Nov 2011, 13:30

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