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

 It is currently 28 May 2015, 14:29

### 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

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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# A company has two types of machines, type R and type S.

 Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:
SVP
Joined: 21 Jul 2006
Posts: 1551
Followers: 8

Kudos [?]: 315 [0], given: 1

A company has two types of machines, type R and type S.  [#permalink]  07 Dec 2007, 05:30
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
A company has two types of machines, type R and type S. Operating at a constant rate, a machine of type R does a certain job in 36 hours and a machine of type S does the same job in 18 hours. If the company used the same number of each type of machine to do the job in 2 hours, how many machines of type R were used?

a) 3
b) 4
c) 6
d) 9
e) 12
VP
Joined: 08 Jun 2005
Posts: 1147
Followers: 6

Kudos [?]: 133 [1] , given: 0

[#permalink]  07 Dec 2007, 05:57
1
KUDOS
Type R = 1/36 of the job ---> In one hour
Type S = 1/18 of the job ---> In one hour

Type R = 2/36 of the job ---> In two hours
Type S = 2/18 of the job ---> In two hours

2/36+2/18 = 6/36 = 1/6

we will need six machines

the answer is (C)

Director
Joined: 26 Jul 2007
Posts: 541
Schools: Stern, McCombs, Marshall, Wharton
Followers: 5

Kudos [?]: 119 [0], given: 0

[#permalink]  07 Dec 2007, 07:47
KillerSquirrel wrote:
Type R = 1/36 of the job ---> In one hour
Type S = 1/18 of the job ---> In one hour

Type R = 2/36 of the job ---> In two hours
Type S = 2/18 of the job ---> In two hours

2/36+2/18 = 6/36 = 1/6

we will need six machines

the answer is (C)

I got the same as killer

R*T=W

(1/36x+1/18x)(2)=1
(x)(1/36+1/18)(2)=1
(x)(3/36)(2)=1
(x)(1/6)=1
x=6

Ans C
SVP
Joined: 21 Jul 2006
Posts: 1551
Followers: 8

Kudos [?]: 315 [0], given: 1

[#permalink]  07 Dec 2007, 07:56
OA is C
[#permalink] 07 Dec 2007, 07:56
Similar topics Replies Last post
Similar
Topics:
29 A company has two types of machines, type R and type S 16 02 Apr 2012, 12:55
3 A company has two types of machines,type R and type S. 8 17 Jan 2010, 12:01
A company has two types of machines, type R and type S. 5 31 Mar 2008, 05:54
3 A company has two types of machines, type R and type S. Oper 4 08 Feb 2007, 21:57
A company has two types of machines, type R and S. Operating 3 25 Dec 2005, 15:22
Display posts from previous: Sort by

# A company has two types of machines, type R and type S.

 Question banks Downloads My Bookmarks Reviews Important topics

 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®.