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 GMAT 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.

It appears that you are browsing the GMAT Club forum unregistered!

Signing up is free, quick, and confidential.
Join other 350,000 members and get the full benefits of GMAT Club

Registration gives you:

Tests

Take 11 tests and quizzes from GMAT Club and leading GMAT prep companies such as Manhattan GMAT,
Knewton, and others. All are free for GMAT Club members.

Applicant Stats

View detailed applicant stats such as GPA, GMAT score, work experience, location, application
status, and more

Books/Downloads

Download thousands of study notes,
question collections, GMAT Club’s
Grammar and Math books.
All are free!

Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:

Little work problem help please [#permalink]
14 Aug 2003, 04:21

I know this one has been posted before, but could someone take me through the steps to get the answer.

Working together, A and B can do a job in 6 days. B and C can do the same job in 10 days, while C and A can do it in 7.5 days. How long will it take if all A, B and C work together to complete the job?

A. 8 days
B. 5 days
C. 3 days
D. 7days

This is new, but is this correct?

3 workers together take 18 hours to complete a job. If a worker is added, who works at the same rate, how long will it take the four of them to complete the job? Second if 3 workers take 18 hours to complete the job, how long will it take 2 workers to do the job if one leaves due to disability?

would the first part be 13.5 hours and the second part be 27 hours?

For the second part you are correct, but you seem unsure of your answer. I will explain.

If three workers acan do this job together in 18 hrs, they they each take 54 hrs to do it alone.
So the answer to the first part is 4/54 = 1/x = 54/4 = 13.5.

And the second is just 2/54 = 1/x = 54/2 = 27.

Good joob Rich, you had the intuition - next will come the confidence!!

Nothing hard for you guys. What I saw was pretty much like my first post where you have x workers and one leaves/ or is added and you have to figure out how long the job will take. I'm kicking myself for not buying the Kaplan 800 book because some of the hard problems I missed are concepts that are covered in that book.

Originally posted on MIT Sloan School of Management : We are busy putting the final touches on our application. We plan to have it go live by July 15...