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

It is currently 29 Aug 2014, 06:14

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

10 machines work at constant rate and working together, they

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Intern
Intern
avatar
Joined: 05 Feb 2006
Posts: 6
Followers: 0

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

10 machines work at constant rate and working together, they [#permalink] New post 04 Mar 2006, 13:10
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 2 sessions
10 machines work at constant rate and working together, they complete a job in 16 hrs. How mny hrs needed if only 8 machines work together to complete a job?
18
20
22
24
26
Manager
Manager
avatar
Joined: 13 Dec 2005
Posts: 225
Location: Milwaukee,WI
Followers: 1

Kudos [?]: 6 [0], given: 0

GMAT Tests User
 [#permalink] New post 04 Mar 2006, 17:21
10 machine can complete in 16 hrs
1 machine can complete in 16*10 =160 hrs
8 machine can complete in 160/8 =20 hrs

hence Ans B ..20
Intern
Intern
avatar
Joined: 26 Feb 2006
Posts: 1
Followers: 0

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

Logic? [#permalink] New post 05 Mar 2006, 12:48
What about?
This may sound wierd. But I want to understand the logic.
10 machines 16hrs
1 machine ?
That is 16/10=1.6hrs. I know it should be 16 *10 but why different way?
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jul 2004
Posts: 5097
Location: Singapore
Followers: 17

Kudos [?]: 136 [0], given: 0

GMAT Tests User
 [#permalink] New post 05 Mar 2006, 19:31
Each machine work at a rate 1/x job in 1 hour
10 machines work at a rate 10/x job in 1 hour

Completed job in 16 hours, so x/10 = 16, x = 160

If there are 8 machines, the job is completed at a rate of 1/20 job per hour, and to finish the job will need 20 hours.

Ans B
Manager
Manager
avatar
Joined: 16 Sep 2005
Posts: 62
Followers: 1

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

Re: PS machine gmat prep [#permalink] New post 07 Mar 2006, 08:18
bh10503 wrote:
10 machines work at constant rate and working together, they complete a job in 16 hrs. How mny hrs needed if only 8 machines work together to complete a job?
18
20
22
24
26


My take is B (20). The explaination as follows.
The way I understand this type of problems is by translating the problem into a ratio. In this problem as the number of machine increases, the number of hours required decreases and vice a versa. So the ratio has to be inversly proportional as follows
10/8 = x/16
So 8x = 160
and x = 20

I hope this makes sense.
_________________

Thanks

Manager
Manager
User avatar
Joined: 24 Oct 2005
Posts: 53
Followers: 1

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

 [#permalink] New post 08 Mar 2006, 18:13
Got B as well

10 machine completes in 16*10 =160 hrs
8 machine can complete in 160/8 =20 hrs
_________________

"The difference between a smart person and a wise person is that
a smart person knows what to say and
a wise person knows whether or not to say it."

  [#permalink] 08 Mar 2006, 18:13
    Similar topics Author Replies Last post
Similar
Topics:
3 Experts publish their posts in the topic Each of 10 machines works at the same constant rate doing a gsaxena26 10 12 Jun 2010, 09:50
11 Experts publish their posts in the topic Six machines, each working at the same constant rate, togeth ggarr 16 27 Nov 2006, 02:04
Each of 10 machines works at the same constant rate doing a sessmi 2 12 Nov 2008, 18:30
Each of 10 machines works at the same constant rate doing a marcodonzelli 3 01 Mar 2008, 23:25
1 6 machines, all working at a constant rate, together can do Jennif102 5 10 Oct 2005, 06:49
Display posts from previous: Sort by

10 machines work at constant rate and working together, they

  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®.