It is currently 19 Nov 2017, 01:53

### 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

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# PS-prep

Author Message
Director
Joined: 03 Sep 2006
Posts: 864

Kudos [?]: 1105 [0], given: 33

### Show Tags

24 Jun 2007, 00:46
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Pl. exp.
Attachments

untitled.PNG [ 68.39 KiB | Viewed 607 times ]

Kudos [?]: 1105 [0], given: 33

Director
Joined: 09 Aug 2006
Posts: 754

Kudos [?]: 260 [0], given: 0

### Show Tags

24 Jun 2007, 03:33
To minimize the number of hrs. that machine B works, we should use the maximum hours that machine A can work,i.e., 8 hours.

Work = Rate * Time

For A:
Rate = 9000 pencils/hr
Time = 8hrs
Work = 72000 pencils

Pencils that remained to be produced = 100000-72000 = 28000

For B:
Rate = 7000 pencils/hr
Work = 28000 pencils
Time = 28000/7000 = 4hrs

The answer according to me should be A. Is this correct?

Kudos [?]: 260 [0], given: 0

24 Jun 2007, 03:33
Display posts from previous: Sort by