Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Apr 2610:00 AM EDT
-11:00 AM EDT
The Target Test Prep course represents a quantum leap forward in GMAT preparation, a radical reinterpretation of the way that students should study. Try before you buy with a 5-day, full-access trial of the course for FREE!
Apr 2711:00 AM EDT
-12:00 PM EDT
Prefer video-based learning? The Target Test Prep OnDemand course is a one-of-a-kind video masterclass featuring 400 hours of lecture-style teaching by Scott Woodbury-Stewart, founder of Target Test Prep and one of the most accomplished GMAT instructors
Apr 2808:00 AM PDT
-11:00 AM PDT
Whether you are just beginning your MBA journey or fine-tuning your path to a 700+ score, GMAT Day is designed to give you a competitive edge.
03 Dec 2019, 01:26
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
42% (02:14) correct
58%
(02:28)
wrong
based on 177
sessions
History
Date
Time
Result
Not Attempted Yet
John and Deborah work together at their college library. If John works on a given day, he won’t work again until the \(j^{th}\) day after that. If Deborah works on a given day, she won’t work again until the \(d^{th}\) day after that. In \(dj-7\) days, the semester will end and John and Deborah will no longer work at the library. If they both work today, will they both work on the same day again before the semester ends?
(1) j is even, and d is odd
(2) None of the prime factors that divide j evenly divide d evenly.
Are You Up For the Challenge: 700 Level Questions
(1) j is even, and d is odd
(2) None of the prime factors that divide j evenly divide d evenly.
Are You Up For the Challenge: 700 Level Questions
03 Dec 2019, 03:31
Kudos
Bookmarks
As per the question John will work on \(j^{th}\) days after today
and Deborah will work \(d^{th}\) day after today.
So, the next time they will work together, it will be the LCM of \(j \)& \(d\)
1) j is even, and d is odd
Clearly NOT Sufficient.
(2) None of the prime factors that divide j evenly divide d evenly.
It means j and d are coprime and hence the LCM will be \(dj\).
So , they will work together on \(dj\) days after today, but the session will be over in \(dj-7\) days
So, they will not be able to work on the same day after today.
SUFFICIENT.
Answer B
and Deborah will work \(d^{th}\) day after today.
So, the next time they will work together, it will be the LCM of \(j \)& \(d\)
1) j is even, and d is odd
Clearly NOT Sufficient.
(2) None of the prime factors that divide j evenly divide d evenly.
It means j and d are coprime and hence the LCM will be \(dj\).
So , they will work together on \(dj\) days after today, but the session will be over in \(dj-7\) days
So, they will not be able to work on the same day after today.
SUFFICIENT.
Answer B
Bunuel
General Discussion
ShankSouljaBoi
Joined: 21 Jun 2017
Last visit: 28 Mar 2026
Posts: 600
Own Kudos:
Given Kudos: 4,090
Location: India
Concentration: Finance, Economics
Schools: Rotman '23 (D) IIMA PGPX'22 (D) Desautels '23 (D) Schulich Sept '23 (D) WBS (D) IIML IPMX'25 (A)
GMAT 1: 660 Q49 V31
GMAT 2: 620 Q47 V30
GMAT 3: 650 Q48 V31
GPA: 3.1
WE:Corporate Finance (Non-Profit and Government)
Products:
Schools: Rotman '23 (D) IIMA PGPX'22 (D) Desautels '23 (D) Schulich Sept '23 (D) WBS (D) IIML IPMX'25 (A)
GMAT 3: 650 Q48 V31
Posts: 600
Kudos:
611
09 Jan 2020, 05:31
Kudos
Bookmarks
For working on the same day LCM will be calculated. This LCM should be less than the number of days left in the semester ie. LCM < dj-7.
Column name ----> j d dj-7
4 3 5 --------> LCM of 4,3 = 12 < dj- 7 = 5 . NO they cant work on same day
8 4 25 --------> LCM of 8,4 = 8 < dj- 7 = 25 . Yes they can work on same day
A is out
B---> j and d are co primes or dont share a comon factor.
IF thats the case LCm of d,j = dj and dj is always > dj - 7 . Hence, we can sufficiently conclude that they cant work on the same day.
B is the correct answer.
Column name ----> j d dj-7
4 3 5 --------> LCM of 4,3 = 12 < dj- 7 = 5 . NO they cant work on same day
8 4 25 --------> LCM of 8,4 = 8 < dj- 7 = 25 . Yes they can work on same day
A is out
B---> j and d are co primes or dont share a comon factor.
IF thats the case LCm of d,j = dj and dj is always > dj - 7 . Hence, we can sufficiently conclude that they cant work on the same day.
B is the correct answer.
