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.
Jun 0408:30 AM PDT
-09:30 AM PDT
For most test takers, Data Insights is the most challenging section on the GMAT, with test takers scoring several points lower on average on DI than on Quant or Verbal and completing the section with less time to spare.
May 2910:00 AM IST
-11:00 PM IST
Start your journey with a fully customized action plan and work with a dedicated mentor to achieve a 735+ score.- Jun 03
08:30 AM PDT
-09:30 AM PDT
In Episode 7 of our GMAT Ninja CR series, we are rounding up the oddballs, the misfits, and the format-benders: EXCEPT, Fill-In-The-Blanks, and other unusual Critical Reasoning question types. When you see a question that ends with a literal blank line - Jun 10
06:00 AM PDT
-06:15 PM PDT
Register for the GMAT Club Virtual MBA Spotlight Fair – the world’s premier event for serious MBA candidates. This is your chance to hear directly from Admissions Directors at nearly every Top 30 MBA program..
11 Mar 2026, 03:33
Kudos
Bookmarks
A contractor was hired to complete a certain construction job in 80 days. To meet this deadline, the contractor initially assigns 120 men, each working 10 hours per day at a constant rate. After 40 days with these 120 men, an inspection shows that only 3/8 of the job has been completed. At that point, how many additional men, working at the same rate and for 10 hours per day, must be hired to finish the job on time?
A. 50
B. 60
C. 70
D. 80
E. 90
A. 50
B. 60
C. 70
D. 80
E. 90
11 Mar 2026, 03:33
Kudos
Bookmarks
Official Solution:
A contractor was hired to complete a certain construction job in 80 days. To meet this deadline, the contractor initially assigns 120 men, each working 10 hours per day at a constant rate. After 40 days with these 120 men, an inspection shows that only 3/8 of the job has been completed. At that point, how many additional men, working at the same rate and for 10 hours per day, must be hired to finish the job on time?
A. 50
B. 60
C. 70
D. 80
E. 90
Work done in first 40 days \(= 120 * 40 * 10 = 48,000\) man-hours.
This equals \(\frac{3}{8}\) of the total work, so total work \(= \frac{48,000}{\frac{3}{8}} = 128,000\) man-hours.
Remaining work \(= 128,000 - 48,000 = 80,000\) man-hours.
Time left \(= 80 - 40 = 40\) days, so each man can do \(40 * 10 = 400\) man-hours.
Men needed for remaining work \(= \frac{80,000}{400} = 200\).
Additional men needed \(= 200 - 120 = 80\).
Answer: D
A contractor was hired to complete a certain construction job in 80 days. To meet this deadline, the contractor initially assigns 120 men, each working 10 hours per day at a constant rate. After 40 days with these 120 men, an inspection shows that only 3/8 of the job has been completed. At that point, how many additional men, working at the same rate and for 10 hours per day, must be hired to finish the job on time?
A. 50
B. 60
C. 70
D. 80
E. 90
Work done in first 40 days \(= 120 * 40 * 10 = 48,000\) man-hours.
This equals \(\frac{3}{8}\) of the total work, so total work \(= \frac{48,000}{\frac{3}{8}} = 128,000\) man-hours.
Remaining work \(= 128,000 - 48,000 = 80,000\) man-hours.
Time left \(= 80 - 40 = 40\) days, so each man can do \(40 * 10 = 400\) man-hours.
Men needed for remaining work \(= \frac{80,000}{400} = 200\).
Additional men needed \(= 200 - 120 = 80\).
Answer: D
