GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video

It is currently 06 Jul 2020, 10:22

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.

Close

Request Expert Reply

Confirm Cancel

Printing press X can print an edition of a newspaper in 12 hours, wher

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 65012
Printing press X can print an edition of a newspaper in 12 hours, wher  [#permalink]

Show Tags

New post 22 May 2020, 09:19
00:00
A
B
C
D
E

Difficulty:

  15% (low)

Question Stats:

85% (01:21) correct 15% (02:08) wrong based on 46 sessions

HideShow timer Statistics

Printing press X can print an edition of a newspaper in 12 hours, whereas press Y can print the same edition in 18 hours. What is the total number of hours that it will take the two presses, working together but independently of one another, to print the same edition?

A. 15
B. 7.4
C. 7.2
D. 7.0
E. 6.8


PS20370

_________________
GMAT Club Legend
GMAT Club Legend
User avatar
V
Joined: 18 Aug 2017
Posts: 6427
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
GMAT ToolKit User Reviews Badge CAT Tests
Re: Printing press X can print an edition of a newspaper in 12 hours, wher  [#permalink]

Show Tags

New post 22 May 2020, 09:34
Bunuel wrote:
Printing press X can print an edition of a newspaper in 12 hours, whereas press Y can print the same edition in 18 hours. What is the total number of hours that it will take the two presses, working together but independently of one another, to print the same edition?

A. 15
B. 7.4
C. 7.2
D. 7.0
E. 6.8


PS20370


combined rate = 1/12 + 1/18 ; 10/72
7.2 hrs
OPTION C
GMAT Club Legend
GMAT Club Legend
User avatar
V
Joined: 11 Sep 2015
Posts: 4955
Location: Canada
GMAT 1: 770 Q49 V46
Re: Printing press X can print an edition of a newspaper in 12 hours, wher  [#permalink]

Show Tags

New post 22 May 2020, 09:39
Top Contributor
Bunuel wrote:
Printing press X can print an edition of a newspaper in 12 hours, whereas press Y can print the same edition in 18 hours. What is the total number of hours that it will take the two presses, working together but independently of one another, to print the same edition?

A. 15
B. 7.4
C. 7.2
D. 7.0
E. 6.8
PS20370


Let's assign a "nice value" to the job a printing an edition of a newspaper.
We're looking for a number that works well with the given information: 12 hours and 18 hours
Since 36 is the least common multiple of 12 and 18, let's say the job requires the printing presses to print a total of 36 newspapers

Printing press X can print an edition of a newspaper in 12 hours
In other words, printing press X can print 36 newspapers in 12 hours
So, its RATE = 3 newspapers per HOUR

Printing press Y can print an edition of a newspaper in 18 hours
In other words, printing press Y can print 36 newspapers in 18 hours
So, its RATE = 2 newspapers per HOUR

What is the total number of hours that it will take the two presses, working together but independently of one another, to print the same edition?
The combined RATE of the two printing presses = 3 + 2 = 5 newspapers per HOUR

Time = output/rate
So the time to print 36 newspapers = 36/5 = 7.2

Answer: C

Cheers,
Brent
_________________
Test confidently with gmatprepnow.com
Image
IESE School Moderator
avatar
S
Joined: 11 Feb 2019
Posts: 292
CAT Tests
Re: Printing press X can print an edition of a newspaper in 12 hours, wher  [#permalink]

Show Tags

New post 24 May 2020, 01:54
C.
Work Rate for X: 1/12
Work Rate for Y: 1/18
Combined Rate: 1/12+1/18 = 5/36
Time: 36/5 = 7.2 hours
_________________

Cheers,
NJ
Manager
Manager
avatar
G
Joined: 02 Jan 2020
Posts: 244
Premium Member
Re: Printing press X can print an edition of a newspaper in 12 hours, wher  [#permalink]

Show Tags

New post 25 May 2020, 06:17
Rate of X=1/12 job per hr

Rate of X=1/18 job per hr

Combined rate =1/12+1/18=5/36 job per hr

Now we know T=W/R=36/5=7.2 hrs
Intern
Intern
avatar
B
Joined: 25 May 2020
Posts: 15
Re: Printing press X can print an edition of a newspaper in 12 hours, wher  [#permalink]

Show Tags

New post 25 May 2020, 07:45
1
To make the calculations easier, let's take the total work as LCM(12,18) = 36 units of work.

Now, printing press X does = \(\frac{36}{12} = 3\) units of work in an hour

printing press Y does = \(\frac{36}{18} = 2\) units of work in an hour

When both these machines work together then the total amount of work done in an hour = \(3 + 2 = 5\) units of work.

Total hours taken to complete the work = \(\frac{36}{5}\) = 7.2 hours.

IMO, OA - C
Bunuel wrote:
Printing press X can print an edition of a newspaper in 12 hours, whereas press Y can print the same edition in 18 hours. What is the total number of hours that it will take the two presses, working together but independently of one another, to print the same edition?

A. 15
B. 7.4
C. 7.2
D. 7.0
E. 6.8


PS20370
GMAT Club Bot
Re: Printing press X can print an edition of a newspaper in 12 hours, wher   [#permalink] 25 May 2020, 07:45

Printing press X can print an edition of a newspaper in 12 hours, wher

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  





cron

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne