Find all School-related info fast with the new School-Specific MBA Forum

It is currently 21 Oct 2014, 16:14

Close

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
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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

DS: bacteria population

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Director
Director
avatar
Joined: 23 Sep 2007
Posts: 798
Followers: 5

Kudos [?]: 82 [0], given: 0

DS: bacteria population [#permalink] New post 19 Jul 2008, 14:42
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
Warning: this question requires that you discard any previous knowledge of bacterial growth characteristics.

Wes works at a science lab that conducts experiments on bacteria. The population of the bacteria multiplies at a constant rate, and his job is to notate the population of a certain group of bacteria each hour. At 1 p.m. on a certain day, he noted that the population was 2,000 and then he left the lab. He returned in time to take a reading at 4 p.m., by which point the population had grown to 250,000. Now he has to fill in the missing data for 2 p.m. and 3 p.m. What was the population at 3 p.m.?
50,000
62,500
65,000
86,666
125,000
Senior Manager
Senior Manager
avatar
Joined: 23 May 2006
Posts: 328
Followers: 2

Kudos [?]: 78 [0], given: 0

Re: DS: bacteria population [#permalink] New post 19 Jul 2008, 15:32
This is a gemometric progression series.

use the formula and you can calcuate the constant term.

2000r^3 = 250,000
r = 5
so at 3 = 2000(5^2) = 50,000

IMO A
SVP
SVP
avatar
Joined: 28 Dec 2005
Posts: 1593
Followers: 2

Kudos [?]: 75 [0], given: 2

Re: DS: bacteria population [#permalink] New post 21 Jul 2008, 04:03
agree with A. you can use the given #s to find out the proportional constant in the relationship (turns out to be 5), and then use that to find out what the pop. was @ 3
Re: DS: bacteria population   [#permalink] 21 Jul 2008, 04:03
    Similar topics Author Replies Last post
Similar
Topics:
2 Population Growth - Bacteria enigma123 4 15 Nov 2011, 14:39
1 Population of a bacteria colony..... WishMasterUA 12 04 Jun 2011, 02:53
The population of a bacteria culture doubles every 2 GMATT73 2 24 Aug 2006, 03:28
DS - population ns 1 11 Jun 2006, 14:46
The population of a certain bacteria is donated by X. In 20 joemama142000 8 20 Feb 2006, 22:39
Display posts from previous: Sort by

DS: bacteria population

  Question banks Downloads My Bookmarks Reviews Important topics  


GMAT Club MBA Forum Home| About| Privacy Policy| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group and phpBB SEO

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®.