GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 17 Aug 2018, 10:08

### 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

we will pick new questions that match your level based on your Timer History

Track

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

# Machine A produces pencils at a constant rate of 9000

Author Message
Manager
Joined: 31 Jul 2006
Posts: 220
Machine A produces pencils at a constant rate of 9000  [#permalink]

### Show Tags

12 Oct 2008, 22:10
Machine A produces pencils at a constant rate of 9000 pencils per hour, and machine B produces pencils
at a constant rate of 7000 pencils per hour. If the two machines together must produce 100,000 pencils and if each machine
can operate for at most 8 hours, what is the least amount of time, in hours, that machine B must operate?
a. 4
b.4 and 2/3
c.5 and 1/3
d. 6
e. 6 and 1/4

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Manager
Joined: 14 Jun 2007
Posts: 158
Location: Vienna, Austria

### Show Tags

13 Oct 2008, 01:29
Total target = 100, 000

Since machine A is faster, and max is 8 hours, we shall allow machine A to orun for 8 hours. It shall thus produce 9000 * 8 = 72, 000 pencils.

We are short by 28, 000, machine B can work for 28K/7K = 4 hours to do it.

A

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Re: Pencils &nbs [#permalink] 13 Oct 2008, 01:29
Display posts from previous: Sort by

# Machine A produces pencils at a constant rate of 9000

Moderator: chetan2u

# Events & Promotions

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.