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Printing press X can print an edition of a newspaper in 12 hours, wher https://gmatclub.com/forum/printingpressxcanprintaneditionofanewspaperin12hourswher324859.html 
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Author:  Bunuel [ 22 May 2020, 09:19 ] 
Post subject:  Printing press X can print an edition of a newspaper in 12 hours, wher 
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 
Author:  Archit3110 [ 22 May 2020, 09:34 ] 
Post subject:  Re: Printing press X can print an edition of a newspaper in 12 hours, wher 
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 
Author:  BrentGMATPrepNow [ 22 May 2020, 09:39 ] 
Post subject:  Re: Printing press X can print an edition of a newspaper in 12 hours, wher 
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 
Author:  NitishJain [ 24 May 2020, 01:54 ] 
Post subject:  Re: Printing press X can print an edition of a newspaper in 12 hours, wher 
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 
Author:  GDT [ 25 May 2020, 06:17 ] 
Post subject:  Re: Printing press X can print an edition of a newspaper in 12 hours, wher 
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 
Author:  itachiuchiha [ 25 May 2020, 07:45 ] 
Post subject:  Re: Printing press X can print an edition of a newspaper in 12 hours, wher 
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 
Author:  EgmatQuantExpert [ 31 Aug 2021, 01:43 ] 
Post subject:  Re: Printing press X can print an edition of a newspaper in 12 hours, wher 
Solution Given • Printing press X can print an edition of a newspaper in 12 hours • Press Y can print the same edition in 18 hours To find • The total number of hours that it will take the two presses, working together but independently of one another, to print the same edition Approach and Working out • Printing Press X
o 1 hour – 1/12 edition
o 1 hour – 1/18 edition
Hence, 1 edition – 36/5 hours = 7.2 hours Correct Answer: Option C 
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