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

It is currently 30 Sep 2014, 22:33

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

Switches

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 16 Apr 2009
Posts: 251
Schools: Ross
Followers: 1

Kudos [?]: 23 [0], given: 10

Switches [#permalink] New post 14 Aug 2009, 06:52
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

33% (04:25) correct 67% (01:38) wrong based on 12 sessions
One-fifth of the light switches produced by a cer¬tain factory are defective. Four-fifths of the defective switches are rejected and 1/20 th of the nondefective switches are rejected by mistake. If all the switches not rejected are sold, what percent of the switches sold by the factory are defective?
(A) 4%
(B) 5%
(C) 6.25%
(D) 11%
(E) 16%
[Reveal] Spoiler:
B

_________________

Keep trying no matter how hard it seems, it will get easier.


Last edited by vannu on 14 Aug 2009, 08:46, edited 1 time in total.
Current Student
User avatar
Joined: 18 Jun 2009
Posts: 361
Location: San Francisco
Schools: Duke,Oxford,IMD,INSEAD
Followers: 8

Kudos [?]: 63 [0], given: 15

Re: Switches [#permalink] New post 14 Aug 2009, 07:55
vannu wrote:
One-fifth of the light switches produced by a cer¬tain factory are defective. Four-fifths of the defective switches are rejected and of the nondefective switches are rejected by mistake. If all the switches not rejected are sold, what percent of the switches sold by the factory are defective?
(A) 4%
(B) 5%
(C) 6.25%
(D) 11%
(E) 16%
[Reveal] Spoiler:
B



I guess there is somethings missing here "Four-fifths of the defective switches are rejected and of the nondefective switches are rejected by mistake"
Manager
Manager
avatar
Joined: 25 Jul 2009
Posts: 117
Schools: NYU, NUS, ISB, DUKE, ROSS, DARDEN
Followers: 4

Kudos [?]: 144 [0], given: 17

Re: Switches [#permalink] New post 14 Aug 2009, 07:59
vannu wrote:
One-fifth of the light switches produced by a cer¬tain factory are defective. Four-fifths of the defective switches are rejected and of the nondefective switches are rejected by mistake. If all the switches not rejected are sold, what percent of the switches sold by the factory are defective?
(A) 4%
(B) 5%
(C) 6.25%
(D) 11%
(E) 16%
[Reveal] Spoiler:
B



There seems to be some missing data in the highlighted part.
_________________

KUDOS me if I deserve it !! :)

My GMAT Debrief - 740 (Q50, V39) | My Test-Taking Strategies for GMAT | Sameer's SC Notes

Intern
Intern
avatar
Joined: 14 Aug 2009
Posts: 1
Followers: 0

Kudos [?]: 1 [0], given: 4

Re: Switches [#permalink] New post 14 Aug 2009, 08:46
i too got confused by the highlighted sentence.. is the prblm statemnt clear..
Senior Manager
Senior Manager
avatar
Joined: 16 Apr 2009
Posts: 251
Schools: Ross
Followers: 1

Kudos [?]: 23 [0], given: 10

Re: Switches [#permalink] New post 14 Aug 2009, 08:47
I edited the question. Sorry for the inconvenience.
_________________

Keep trying no matter how hard it seems, it will get easier.

1 KUDOS received
SVP
SVP
User avatar
Joined: 05 Jul 2006
Posts: 1541
Followers: 5

Kudos [?]: 78 [1] , given: 39

Re: Switches [#permalink] New post 14 Aug 2009, 08:58
1
This post received
KUDOS
vannu wrote:
One-fifth of the light switches produced by a cer¬tain factory are defective. Four-fifths of the defective switches are rejected and 1/20 th of the nondefective switches are rejected by mistake. If all the switches not rejected are sold, what percent of the switches sold by the factory are defective?
(A) 4%
(B) 5%
(C) 6.25%
(D) 11%
(E) 16%
[Reveal] Spoiler:
B


assume 1000 produced

200 defective , 160 defective and rejected, 40 nondefective rejected by mistake

40 defective and not rejected , 760 non defective and not rejected, total non rejected and sold = 800

percent of the switches sold by the factory are defective = 40/800*100 = 5%
Manager
Manager
avatar
Joined: 25 Jul 2009
Posts: 117
Schools: NYU, NUS, ISB, DUKE, ROSS, DARDEN
Followers: 4

Kudos [?]: 144 [0], given: 17

Re: Switches [#permalink] New post 14 Aug 2009, 09:03
vannu wrote:
One-fifth of the light switches produced by a cer¬tain factory are defective. Four-fifths of the defective switches are rejected and 1/20 th of the nondefective switches are rejected by mistake. If all the switches not rejected are sold, what percent of the switches sold by the factory are defective?
(A) 4%
(B) 5%
(C) 6.25%
(D) 11%
(E) 16%
[Reveal] Spoiler:
B


Assume x as the number of switches and that x =100
Defective Switches = 1/5 * 100 = 20
Defective Switches that are rejected = 4/5 * 20 = 16
Defective Switches that are sold = 20 - 16 = 4

Non-defective Switches = 100 - 20 = 80
Non-defective Switches mistakenly rejected = 80*1/20 = 4
Non-defective Switches that are sold = 80 - 4 = 76

Total sold in the market = 76 + 4 = 80
% of defective = (4/80)*100 = 5%

ANS: B
_________________

KUDOS me if I deserve it !! :)

My GMAT Debrief - 740 (Q50, V39) | My Test-Taking Strategies for GMAT | Sameer's SC Notes

Senior Manager
Senior Manager
avatar
Joined: 15 Feb 2011
Posts: 263
Followers: 4

Kudos [?]: 23 [0], given: 9

Re: Switches [#permalink] New post 10 Jul 2011, 10:40
This may be a very stupid question but please help me understand how did we derive at(4/80)*100 ??

Is there a formula for this??
Math Forum Moderator
avatar
Joined: 20 Dec 2010
Posts: 2046
Followers: 127

Kudos [?]: 931 [0], given: 376

Re: Switches [#permalink] New post 10 Jul 2011, 11:04
vannu wrote:
One-fifth of the light switches produced by a certain factory are defective. Four-fifths of the defective switches are rejected and 1/20 th of the nondefective switches are rejected by mistake. If all the switches not rejected are sold, what percent of the switches sold by the factory are defective?
(A) 4%
(B) 5%
(C) 6.25%
(D) 11%
(E) 16%
[Reveal] Spoiler:
B





RejectedNot Rejected
Defectiveabc
Not Defectivedef
ghi


Fill in this order:
i=100
1/5 of total= Defective i.e. 1/5*100=20 Defective. c=20
Not Defective=100-20=80, f=80

4/5 of Defective=Rejected= 4/5*20=16. a=16
b=c-a i.e. b=20-16=4

1/20 th of the nondefective switches are rejected
1/20*80=4. d=4
g=a+d=16+4=20

h=i-g=100-20=80

Defective+Not Rejected=b=4
Total Not Rejected=h=80

%=4/80*100=5




RejectedNot Rejected
Defective16420
Not Defective4e80
2080100


Ans: "B"
_________________

~fluke

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Senior Manager
Senior Manager
avatar
Joined: 15 Feb 2011
Posts: 263
Followers: 4

Kudos [?]: 23 [0], given: 9

Re: Switches [#permalink] New post 10 Jul 2011, 11:15
thanks fluke, dis approach did help me understand the question better...

this was my first post..i have couple of more questions wherein i need your advice..pls suggest if i need to open up a new topic for every question or can i post my queries alongside the existing post..like what i did in this one..

thanks again!!
Math Forum Moderator
avatar
Joined: 20 Dec 2010
Posts: 2046
Followers: 127

Kudos [?]: 931 [0], given: 376

Re: Switches [#permalink] New post 10 Jul 2011, 11:51
DeeptiM wrote:
thanks fluke, dis approach did help me understand the question better...

this was my first post..i have couple of more questions wherein i need your advice..pls suggest if i need to open up a new topic for every question or can i post my queries alongside the existing post..like what i did in this one..

thanks again!!


Please reply to the existing post. If the question is not discussed before, create a new thread.
_________________

~fluke

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: Switches   [#permalink] 10 Jul 2011, 11:51
    Similar topics Author Replies Last post
Similar
Topics:
Switching careers tarheel1226 0 09 Sep 2012, 18:04
Post-MBA career switch hosam 1 20 Nov 2006, 10:08
Post-MBA career switch hosam 1 20 Nov 2006, 09:28
career switch cat 0 14 Feb 2005, 09:41
Switch to Operations? SR92612 1 13 Oct 2004, 11:56
Display posts from previous: Sort by

Switches

  Question banks Downloads My Bookmarks Reviews Important topics  


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®.