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

It is currently 30 Aug 2014, 10:30

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

Jonathan can type a 20 page document in 40 minutes, Susan

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
1 KUDOS received
Intern
Intern
avatar
Joined: 08 Oct 2009
Posts: 8
Followers: 0

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

Jonathan can type a 20 page document in 40 minutes, Susan [#permalink] New post 12 Oct 2009, 11:42
1
This post received
KUDOS
1
This post was
BOOKMARKED
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

82% (02:24) correct 18% (02:10) wrong based on 131 sessions
Jonathan can type a 20 page document in 40 minutes, Susan can type it in 30 minutes, and Jack can type it in 24 minutes. Working together, how much time will it take them to type the same document?

A. 5 minutes
B. 10 minutes
C. 15 minutes
D. 18 minutes
E. 20 minutes
[Reveal] Spoiler: OA

Last edited by Bunuel on 09 Feb 2012, 12:58, edited 1 time in total.
Edited the question and added the OA
Expert Post
1 KUDOS received
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 25207
Followers: 3419

Kudos [?]: 25089 [1] , given: 2702

Re: Working together question [#permalink] New post 12 Oct 2009, 12:00
1
This post received
KUDOS
Expert's post
timmaxwell8 wrote:
30. Jonathan can type a 20 page document in 40 minutes, Susan can type it in 30 minutes, and Jack can type it in 24 minutes. Working together, how much time will it take them to type the same document?

A. 5 minutes
B. 10 minutes
C. 15 minutes
D. 18 minutes
E. 20 minutes


J=20/40=1/2per min
S=20/30=2/3per min
JK=20/24=5/6per min

In one min together 1/2+2/3+5/6=12/6=2 pages.

For 20 pages=20/2=10

B.
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

3 KUDOS received
Senior Manager
Senior Manager
avatar
Joined: 18 Aug 2009
Posts: 439
Schools: UT at Austin, Indiana State University, UC at Berkeley
WE 1: 5.5
WE 2: 5.5
WE 3: 6.0
Followers: 6

Kudos [?]: 47 [3] , given: 16

GMAT Tests User
Re: Working together question [#permalink] New post 12 Oct 2009, 20:13
3
This post received
KUDOS
You may set up common equation like this:

job/A+job/B+job/C=job/x
Memorize this universal formula, you will need it definitely for GMAT.

and find x from this equation
In this specific case, the equation will look like this:

20/40+20/30+20/24=20/x
If you solve this equation, you get the same answer D (10)

If you like my post, please give me kudos. :)
_________________

Never give up,,,

Manager
Manager
avatar
Joined: 15 Sep 2009
Posts: 139
Followers: 1

Kudos [?]: 15 [0], given: 2

Re: Working together question [#permalink] New post 13 Oct 2009, 09:23
I will go with option B)10
Manager
Manager
avatar
Joined: 12 Oct 2009
Posts: 115
Followers: 2

Kudos [?]: 20 [0], given: 3

Re: Working together question [#permalink] New post 13 Oct 2009, 09:54
Bunuel wrote:
timmaxwell8 wrote:
30. Jonathan can type a 20 page document in 40 minutes, Susan can type it in 30 minutes, and Jack can type it in 24 minutes. Working together, how much time will it take them to type the same document?

A. 5 minutes
B. 10 minutes
C. 15 minutes
D. 18 minutes
E. 20 minutes


J=20/40=1/2per min
S=20/30=2/3per min
JK=20/24=5/6per min

In one min together 1/2+2/3+5/6=12/6=2 pages.

For 20 pages=20/2=10

B.



If the work involved here is to type the 20page document we can even avoid calculating time taken per page.
will this apporach backfire?

Regards
Asterix
"Time is of gr8 essence"
Manager
Manager
User avatar
Joined: 18 Jul 2009
Posts: 170
Location: India
Schools: South Asian B-schools
Followers: 2

Kudos [?]: 59 [0], given: 37

GMAT Tests User
Re: Working together question [#permalink] New post 13 Oct 2009, 10:14
1/40+1/30+1/24 = 24/240 = 1/10 work per min = 10 min to complete work :wink:
_________________

Bhushan S.
If you like my post....Consider it for Kudos :-D

Director
Director
User avatar
Joined: 01 Apr 2008
Posts: 909
Schools: IIM Lucknow (IPMX) - Class of 2014
Followers: 15

Kudos [?]: 205 [0], given: 18

GMAT Tests User
Re: Working together question [#permalink] New post 17 Oct 2009, 22:32
Formula for time taken by 3 guys is:

t1*t2*t3 / ( t1*t2 + t2*t3 + t3*t1 ) , this might be lead to a faster calculation :)
Manager
Manager
avatar
Joined: 25 May 2011
Posts: 163
Followers: 2

Kudos [?]: 37 [0], given: 71

GMAT Tests User
Re: Working together question [#permalink] New post 29 Oct 2011, 05:42
I made a stupid mistake! :oops:
SVP
SVP
User avatar
Joined: 09 Sep 2013
Posts: 2223
Followers: 185

Kudos [?]: 36 [0], given: 0

Premium Member
Re: Jonathan can type a 20 page document in 40 minutes, Susan [#permalink] New post 21 Oct 2013, 05:44
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________

GMAT Books | GMAT Club Tests | Best Prices on GMAT Courses | GMAT Mobile App | Math Resources | Verbal Resources

Re: Jonathan can type a 20 page document in 40 minutes, Susan   [#permalink] 21 Oct 2013, 05:44
    Similar topics Author Replies Last post
Similar
Topics:
7 Experts publish their posts in the topic If two typists can type two pages in two minutes, how many t arkle 10 10 Sep 2012, 16:06
7 Experts publish their posts in the topic Working together, John and Jack can type 20 pages in one hou Barkatis 7 09 Oct 2010, 00:26
Working together, John and Jack can type 20 pages in one marcodonzelli 3 17 Feb 2008, 05:37
1 working together, John and Jack can type 20 pages in 1hr. If grad_mba 3 11 Jun 2007, 19:54
3 typists working together can type 36 pages in 30 minutes. desiguy 5 07 Dec 2005, 06:29
Display posts from previous: Sort by

Jonathan can type a 20 page document in 40 minutes, Susan

  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®.