Author 
Message 
TAGS:

Hide Tags

Intern
Joined: 20 Jun 2011
Posts: 42

On Monday Elton arrived at the recording studio at 8:00 am
[#permalink]
Show Tags
29 Jul 2012, 13:19
Question Stats:
69% (02:09) correct 31% (02:15) wrong based on 371 sessions
HideShow timer Statistics
On Monday Elton arrived at the recording studio at 8:00 am, and left at noon (12:00 pm), after he had finished recording \(\frac{5}{9}\) of his new album. On Tuesday he arrived at 8:10 am, and left after he had completed recording the entire album, while working at the same rate as the day before. At what time did Elton leave the recording studio on Tuesday? A. 11:12 am B. 11:22 am C. 11:30 am D. 3:12 pm E. 3:22 pm
Official Answer and Stats are available only to registered users. Register/ Login.




Math Expert
Joined: 02 Sep 2009
Posts: 65187

Re: On Monday Elton arrived at the recording studio at 8:00 am
[#permalink]
Show Tags
29 Jul 2012, 14:18
superpus07 wrote: On Monday Elton arrived at the recording studio at 8:00 am, and left at noon (12:00 pm), after he had finished recording \(\frac{5}{9}\) of his new album. On Tuesday he arrived at 8:10 am, and left after he had completed recording the entire album, while working at the same rate as the day before. At what time did Elton leave the recording studio on Tuesday?
A. 11:12 am B. 11:22 am C. 11:30 am D. 3:12 pm E. 3:22 pm Given that 5 parts of the work was done in 4 hours and 4 parts remain to be done. Now, since 5 parts need 4 hours, then 4 parts will need 4/5*4 = 16/5 hours = 3 hours and 12 minutes. Therefore, if the work on Tuesday started at 8:10 am, then it would be finished at 8:10 am + 3 hours and 12 minutes = 11:22 am. Answer: B. Hope it's clear.
_________________




Intern
Joined: 20 Jun 2011
Posts: 42

Re: On Monday Elton arrived at the recording studio at 8:00 am
[#permalink]
Show Tags
29 Jul 2012, 14:26
Bunuel wrote: superpus07 wrote: On Monday Elton arrived at the recording studio at 8:00 am, and left at noon (12:00 pm), after he had finished recording \(\frac{5}{9}\) of his new album. On Tuesday he arrived at 8:10 am, and left after he had completed recording the entire album, while working at the same rate as the day before. At what time did Elton leave the recording studio on Tuesday?
A. 11:12 am B. 11:22 am C. 11:30 am D. 3:12 pm E. 3:22 pm Given that 5 parts of the work was done in 4 hours and 4 parts remain to be done. Now, since 5 parts need 4 hours, then 4 parts will need 4/5*4 = 16/5 hours = 3 hours and 12 minutes. Therefore, if the work on Tuesday started at 8:10 am, then it would be finished at 8:10 am + 3 hours and 12 minutes = 11:22 am. Answer: B. Hope it's clear. Thanks, but why not 4/9 parts?



Math Expert
Joined: 02 Sep 2009
Posts: 65187

Re: On Monday Elton arrived at the recording studio at 8:00 am
[#permalink]
Show Tags
29 Jul 2012, 14:28
superpus07 wrote: Bunuel wrote: superpus07 wrote: On Monday Elton arrived at the recording studio at 8:00 am, and left at noon (12:00 pm), after he had finished recording \(\frac{5}{9}\) of his new album. On Tuesday he arrived at 8:10 am, and left after he had completed recording the entire album, while working at the same rate as the day before. At what time did Elton leave the recording studio on Tuesday?
A. 11:12 am B. 11:22 am C. 11:30 am D. 3:12 pm E. 3:22 pm Given that 5 parts of the work was done in 4 hours and 4 parts remain to be done. Now, since 5 parts need 4 hours, then 4 parts will need 4/5*4 = 16/5 hours = 3 hours and 12 minutes. Therefore, if the work on Tuesday started at 8:10 am, then it would be finished at 8:10 am + 3 hours and 12 minutes = 11:22 am. Answer: B. Hope it's clear. Thanks, but why not 4/9 parts? We are told that 5/9 of the work was done on Monday, so 5 parts out of 9 was done and 4 parts are left to be done.
_________________



Intern
Joined: 20 Jun 2011
Posts: 42

Re: On Monday Elton arrived at the recording studio at 8:00 am
[#permalink]
Show Tags
29 Jul 2012, 14:39
Bunuel wrote: We are told that 5/9 of the work was done on Monday, so 5 parts out of 9 was done and 4 parts are left to be done.
What I'm thinking about is why is it 4/5*4 instead of 4/9*5? Clearly, I'm wrong. But I can't seem to grasp this particular part. Is it because we have to find how much 4 parts is over 5 parts in terms of time?



Math Expert
Joined: 02 Sep 2009
Posts: 65187

Re: On Monday Elton arrived at the recording studio at 8:00 am
[#permalink]
Show Tags
29 Jul 2012, 14:42
superpus07 wrote: Bunuel wrote: We are told that 5/9 of the work was done on Monday, so 5 parts out of 9 was done and 4 parts are left to be done.
What I'm thinking about is why is it 4/5*4 instead of 4/9*5? Clearly, I'm wrong. But I can't seem to grasp this particular part. Is it because we have to find how much 4 parts is over 5 parts in terms of time? 5 parts need 4 hour, so 1 part need 4/5 hours, which means that 4 parts need 4*(4/5) hours.
_________________



Senior Manager
Joined: 13 Aug 2012
Posts: 386
Concentration: Marketing, Finance
GPA: 3.23

Re: On Monday Elton arrived at the recording studio at 8:00 am
[#permalink]
Show Tags
15 Nov 2012, 02:31
Monday: 4 hours to do 5/9 of the work
\(\frac{1}{m}(4)=\frac{5}{9}\) \(\frac{1}{m}=\frac{5}{36}\)
How many hours to finish the remaining 1\(\frac{5}{9}=\frac{4}{9}\)
\(\frac{5}{36}(t)=\frac{4}{9}==>t=\frac{16}{5}=3\frac{1}{5}hours=3hrs12min\)
8:10 + 3hrs12min = 11:22



EMPOWERgmat Instructor
Status: GMAT Assassin/CoFounder
Affiliations: EMPOWERgmat
Joined: 19 Dec 2014
Posts: 17070
Location: United States (CA)

Re: On Monday Elton arrived at the recording studio at 8:00 am
[#permalink]
Show Tags
14 Jan 2015, 15:59
Hi All, If you're ever confused by "fractional data" that includes measurements (in this case, "hours"), you might be able to avoid doing "fractional math" by converting units. Here's how: We're told that it takes 4 hours to complete 5/9 of a job. 4 hours = 4(60) = 240 minutes to complete 5/9 of a job Since 240 = (5/9) of the job 240/5 = 1/9 of the job 48 minutes = 1/9 of the job From here, figuring out how long it will take to finish the final 4/9 of the job won't be too tough.. 48(4) = 192 minutes = 4/9 of the job 192 minutes = 3 hours 12 minutes It's important to note that we're starting from 8:10 am, so an additional 3 hours 12 minutes takes us to 11:22am Final Answer: GMAT assassins aren't born, they're made, Rich
_________________
Contact Rich at: Rich.C@empowergmat.comThe Course Used By GMAT Club Moderators To Earn 750+ souvik101990 Score: 760 Q50 V42 ★★★★★ ENGRTOMBA2018 Score: 750 Q49 V44 ★★★★★



SVP
Status: The Best Or Nothing
Joined: 27 Dec 2012
Posts: 1706
Location: India
Concentration: General Management, Technology
WE: Information Technology (Computer Software)

Re: On Monday Elton arrived at the recording studio at 8:00 am
[#permalink]
Show Tags
14 Jan 2015, 18:10
On Monday, took 240 minutes to complete 5/9 album
Time required to complete remaining album \(= (1  \frac{5}{9}) * 240 * \frac{9}{5} = 192 minutes\)
192 minutes = 3 hours 12 minutes
Counting from 8:10AM = 11:10AM + 12 minutes = 11:22 Minutes
Answer = A



Board of Directors
Joined: 17 Jul 2014
Posts: 2422
Location: United States (IL)
Concentration: Finance, Economics
GMAT 1: 650 Q49 V30
GPA: 3.92
WE: General Management (Transportation)

Re: On Monday Elton arrived at the recording studio at 8:00 am
[#permalink]
Show Tags
14 Nov 2015, 12:27
he completed 5/9 in 4 hours. knowing this, we can calculate his rate in 1 hour or 5/9*1/4 = 5/36. Each hour, he completes 5 parts of the work. since he worked for 4 hours, he completed 20 parts of the work, leaving 16 parts for the next day. now this gets interesting. 16 parts that's slightly more than 3 hours. We can eliminate answer choices D and E. since 16/5 = 3 with a remainder 1, we can calculate that 1/5 of an hour is 12 minutes. Since he started working on the album at 8:10 AM, after 3hours 12 minutes he finished. 10+12 = 22, thus it must be B, 11:22.



Intern
Joined: 18 Apr 2011
Posts: 37
Location: United States
WE: Information Technology (Computer Software)

Re: On Monday Elton arrived at the recording studio at 8:00 am
[#permalink]
Show Tags
05 Jul 2016, 07:44
superpus07 wrote: On Monday Elton arrived at the recording studio at 8:00 am, and left at noon (12:00 pm), after he had finished recording \(\frac{5}{9}\) of his new album. On Tuesday he arrived at 8:10 am, and left after he had completed recording the entire album, while working at the same rate as the day before. At what time did Elton leave the recording studio on Tuesday?
A. 11:12 am B. 11:22 am C. 11:30 am D. 3:12 pm E. 3:22 pm Working rate is same, as per the question. So, \(\frac{5}{9} * \frac{1}{4} = \frac{4}{9} * \frac{1}{t}\) where \(\frac{4}{9}\) is the remaining job and t = time taken to complete remaining job. so, we get t = \(\frac{16}{5}\) i.e. 3 hrs and 12 mins, hence B is the answer



Target Test Prep Representative
Status: Founder & CEO
Affiliations: Target Test Prep
Joined: 14 Oct 2015
Posts: 11083
Location: United States (CA)

Re: On Monday Elton arrived at the recording studio at 8:00 am
[#permalink]
Show Tags
11 Jan 2018, 14:02
superpus07 wrote: On Monday Elton arrived at the recording studio at 8:00 am, and left at noon (12:00 pm), after he had finished recording \(\frac{5}{9}\) of his new album. On Tuesday he arrived at 8:10 am, and left after he had completed recording the entire album, while working at the same rate as the day before. At what time did Elton leave the recording studio on Tuesday?
A. 11:12 am B. 11:22 am C. 11:30 am D. 3:12 pm E. 3:22 pm We can create a proportion in which we let n = the time to complete the album: (5/9)/4 = (4/9)/n 5/36 = 4/(9n) 45n = 144 n = 144/45 = 16/5 = 3 1/5 hours = 3 hours and 12 minutes Since he arrived at 8:10 am on Tuesday, he left at 11:22 am. Answer: B
_________________
★
★
★
★
★
214 REVIEWS
5STARS RATED ONLINE GMAT QUANT SELF STUDY COURSE
NOW WITH GMAT VERBAL (BETA)
See why Target Test Prep is the top rated GMAT quant course on GMAT Club. Read Our Reviews



VP
Joined: 07 Dec 2014
Posts: 1259

On Monday Elton arrived at the recording studio at 8:00 am
[#permalink]
Show Tags
11 Jan 2018, 14:29
superpus07 wrote: On Monday Elton arrived at the recording studio at 8:00 am, and left at noon (12:00 pm), after he had finished recording \(\frac{5}{9}\) of his new album. On Tuesday he arrived at 8:10 am, and left after he had completed recording the entire album, while working at the same rate as the day before. At what time did Elton leave the recording studio on Tuesday?
A. 11:12 am B. 11:22 am C. 11:30 am D. 3:12 pm E. 3:22 pm let t=tuesday hours t/(4/9)=4/(5/9) t=3.2 hrs=3 hrs 12 min 8:10 am+3:12=11:22 am B



NonHuman User
Joined: 09 Sep 2013
Posts: 15412

Re: On Monday Elton arrived at the recording studio at 8:00 am
[#permalink]
Show Tags
30 May 2020, 22:30
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.
_________________




Re: On Monday Elton arrived at the recording studio at 8:00 am
[#permalink]
30 May 2020, 22:30




