Last visit was: 05 Nov 2024, 08:39 It is currently 05 Nov 2024, 08:39

Close

GRE Prep 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 GRE 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
User avatar
Retired Moderator
Joined: 07 Jun 2014
Posts: 4813
Own Kudos [?]: 11136 [11]
Given Kudos: 0
GRE 1: Q167 V156
WE:Business Development (Energy and Utilities)
Send PM
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Own Kudos [?]: 12176 [3]
Given Kudos: 136
Send PM
avatar
Intern
Intern
Joined: 05 Jan 2016
Posts: 6
Own Kudos [?]: 7 [0]
Given Kudos: 0
Send PM
User avatar
Senior Manager
Senior Manager
Joined: 10 Feb 2020
Posts: 496
Own Kudos [?]: 346 [0]
Given Kudos: 299
Send PM
Re: GRE Math Challenge #27-Working alone jerry can complete [#permalink]
2
Working alone Jerry can complete a work in 6 minutes.Working alone ,Adam can complete a work in 8 minutes.Working together,Jerry leaves the work after 2 minutes.How long will it take Adam to complete the work?

LCM of 8 and 6 is 24
so W=24

Jerry:
W=RT
24=R6
R=4 per min

Adam:
W=RT
24=R8
R=3 per min

Total Rate = R1 + R2
R=3+4
R=7 per min

If they work for 2 mins together with the same rate they can complete:
W=RT
W=7*2
W=14

14 units they can complete together. So, 24-14 = 10 units will remain. Adam's rate is 3 therefore,
10=3*T
T=10/3 min = 3.33*60 = 200 seconds

Originally posted by Farina on 16 Jun 2020, 22:45.
Last edited by Farina on 19 Aug 2020, 22:42, edited 2 times in total.
avatar
Intern
Intern
Joined: 03 Jun 2020
Posts: 1
Own Kudos [?]: 0 [0]
Given Kudos: 0
Send PM
Re: GRE Math Challenge #27-Working alone jerry can complete [#permalink]
I feel the question is kinda misleading in the end. It should ask for how long did Adam work MORE than Jerry in the job together. Because I tried to add Adam's total time as '2 minutes with jerry' PLUS '200 seconds' individually and got an answer of 320 seconds.
Intern
Intern
Joined: 25 Nov 2023
Posts: 43
Own Kudos [?]: 19 [1]
Given Kudos: 222
Concentration: Finance, Technology
Send PM
Re: GRE Math Challenge #27-Working alone jerry can complete [#permalink]
1
Let the work be to clean 48rooms since 48 is a multiple of 6 & 8.
So for Jerry, he cleans 48rooms in 6mins, that's 8rooms/min
Adam cleans 48rooms in 8mins, which is 6rooms/min.

Working together for 2 minutes before Jerry leaves, their combined respective cleaning rates per minute cleans a total of 18 rooms (Jerry 8*2 = 16 + Adam 6*2 = 12). So the new total of rooms to be cleaned by Adam alone is 48 - 28 = 20 rooms. But Adam cleans at 6rooms/min. Thus the time it'll take Adam to clean 20 rooms = 20/6 = 3.3mins or 200 seconds. Hope this helps
Prep Club for GRE Bot
Re: GRE Math Challenge #27-Working alone jerry can complete [#permalink]
Moderators:
GRE Instructor
77 posts
GRE Forum Moderator
37 posts
Moderator
1111 posts
GRE Instructor
228 posts

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