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VP
Joined: 14 May 2006
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In year x, it rained on 40% of all Mondays and 20% of all
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08 Aug 2006, 12:26
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In year x, it rained on 40% of all Mondays and 20% of all Tuesdays. On what percentage of all the weekdays in year x did it NOT rain?
(1) During year x, it rained on 10% of all Wednesdays.
(2) During year x, it did not rain on 70% of Thursdays and it did not rain on 95% of all Fridays.
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Senior Manager
Joined: 05 Mar 2006
Posts: 346

IMO C
Because...
52 mondays, tuesdays etc.... in a year
Number of days it did NOT rain:
Monday = 0.6*52
Tuesday = 0.8*52
Wednesday = 0.9*52
Thursday = 0.7*52
Friday = 0.95*52
% No Rain = Number of days it did not rain / Number of total days
Therefore: [(0.6*52)+(0.8*52)+(0.9*52)+(0.7*52)+(0.95*52)]/(52*5)
=79/100 = 79% of the weekdays it did not rain.
You need both statements to capture the information.



Director
Joined: 06 May 2006
Posts: 758

Yeah  agree with C.
Each weekday constitutes 20% of the number of days. Calculating, we get no rain on 79% of the weekdays...
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Uh uh. I know what you're thinking. "Is the answer A, B, C, D or E?" Well to tell you the truth in all this excitement I kinda lost track myself. But you've gotta ask yourself one question: "Do I feel lucky?" Well, do ya, punk?



VP
Joined: 29 Dec 2005
Posts: 1288

Re: DS: Rain
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08 Aug 2006, 13:31
u2lover wrote: In year x, it rained on 40% of all Mondays and 20% of all Tuesdays. On what percentage of all the weekdays in year x did it NOT rain? (1) During year x, it rained on 10% of all Wednesdays. (2) During year x, it did not rain on 70% of Thursdays and it did not rain on 95% of all Fridays. please explain
do we know that the 365th day is weekdays or weekends? do we also know how many days are there in weekdays?
should be E.



CEO
Joined: 20 Nov 2005
Posts: 2781
Schools: Completed at SAID BUSINESS SCHOOL, OXFORD  Class of 2008

agsfaltex wrote: IMO C
Because...
52 mondays, tuesdays etc.... in a year
Number of days it did NOT rain:
Monday = 0.6*52 Tuesday = 0.8*52 Wednesday = 0.9*52 Thursday = 0.7*52 Friday = 0.95*52
% No Rain = Number of days it did not rain / Number of total days
Therefore: [(0.6*52)+(0.8*52)+(0.9*52)+(0.7*52)+(0.95*52)]/(52*5)
=79/100 = 79% of the weekdays it did not rain.
You need both statements to capture the information.
Have you taken the one more day remaining. there are 52 full weeks and one more day and that day can be any day of week. Also we don't know if year x is a leap year or not. If leap year there will be two extra days.
If the answer is NOT E then it is very poorly worded question.
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VP
Joined: 02 Jun 2006
Posts: 1207

I was going to go with C until I read Prof's and PS's post....
Maybe it is E... cannot assume weekday is MonFri; Cannot assume X is a leap year or not...



Manager
Joined: 26 Jun 2006
Posts: 151

Is there an official position by GMAT regarding number of days in year?
Also, in some areas the week starts on Sunday...



VP
Joined: 14 May 2006
Posts: 1313

v1rok wrote: Is there an official position by GMAT regarding number of days in year?
Also, in some areas the week starts on Sunday...
in the mind of GMAT (GMAT doesn't have a mind... haha), which happens to be written in the US, the work week starts on Monday, but the calendar starts on Sunday... go figure... so this part is overthinking IMO...
however, yes... the problem here is that we don't know if the year X started from weekend or from one of the week days (in that case which week day is also unknown)
OA is E



Manager
Joined: 08 May 2004
Posts: 156
Location: Pittsburgh

Exactly, we don't know what the first day of the year was
It is E
We could only calculate an approximation with the available choices.



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Joined: 09 Sep 2013
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Re: In year x, it rained on 40% of all Mondays and 20% of all
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05 Aug 2018, 23:10
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Re: In year x, it rained on 40% of all Mondays and 20% of all &nbs
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05 Aug 2018, 23:10






