Find all School-related info fast with the new School-Specific MBA Forum
Learn more about the recent changes... close

It is currently 22 May 2013, 02:00
Customize  |  Hide

Search
Register
New posts
Unanswered

M09 #12

  Question banks Downloads My Bookmarks Reviews  
  Oldest Best Reply
Search for:
 
Print view
First unread post
Author Message
Director
Director
User avatar
Joined: 25 Oct 2008
Posts: 619
Location: Kolkata,India
Followers: 6

Kudos [?]: 93 [0], given: 100

GMAT Tests User
M09 #12 [#permalink] New post 05 Oct 2009, 18:22
If the power of an engine grows by 10% when the number of its cylinders is increased by one, which of the following is closest to the ratio of the power of a 9-cylinder engine to that of a 12-cylinder engine?
# 0.69
# 0.71
# 0.72
# 0.75
# 0.78
_________________

countdown-beginshas-ended-85483-40.html#p649902

Manager
Manager
Joined: 10 Jul 2009
Posts: 174
Followers: 1

Kudos [?]: 17 [0], given: 8

GMAT Tests User
Re: M09 #12 [#permalink] New post 06 Oct 2009, 21:29
Let power of 9 cylinder engine is p
Power of 9 cylinder / Power of 11 cylinder = p/(1.1*1.1*1.1 *p) = 1000/1331 ~ 100/133
= 100/ (4 *100/3) ( As 4/3 = 1.33)
= 3/4 = .75
Director
Director
User avatar
Joined: 25 Oct 2008
Posts: 619
Location: Kolkata,India
Followers: 6

Kudos [?]: 93 [0], given: 100

GMAT Tests User
Re: M09 #12 [#permalink] New post 06 Oct 2009, 23:00
Could you please elaborate?It's not clear..
_________________

countdown-beginshas-ended-85483-40.html#p649902

Manager
Manager
Joined: 10 Jul 2009
Posts: 174
Followers: 1

Kudos [?]: 17 [0], given: 8

GMAT Tests User
Re: M09 #12 [#permalink] New post 07 Oct 2009, 10:34
Let power of 9 cylinder engine is a
Power of 10 cylinder engine = a* 110/100 = 1.1a
Power of 11 cylinder engine = 110/100(1.1a)
= 1.1*1.1*a
Similarly power of 12 cylinder engine = 1.1*1.1*1.1*a

Power of 9 cylinder engine / Power of 12 cylinder engine = a/(1.1*1.1*1.1*a)
= 1/1.331 = 1000/1331 ~ 100/133

but 133 can be written as 400/3
So 100/133 = 100/(400/3) = 3/4 = 0.75
Re: M09 #12   [#permalink] 07 Oct 2009, 10:34
    Similar topics Author Replies Last post
Similar
Topics:
 Popular new posts 8 EXPERTS_POSTS_IN_THIS_TOPIC m09 q22 CrushTheGMAT 38 07 Sep 2008, 13:18
Popular new posts 9 EXPERTS_POSTS_IN_THIS_TOPIC M09 #20 ritula 20 10 Nov 2008, 03:24
New posts m09 #34 ritula 6 10 Nov 2008, 04:10
Popular new posts 11 EXPERTS_POSTS_IN_THIS_TOPIC M09 Q11 mbaobsessed 18 19 Nov 2008, 07:03
Popular new posts 5 M09#12 sidhu4u 24 28 May 2010, 09:54
Display posts from previous: Sort by

M09 #12

  Question banks Downloads My Bookmarks Reviews  
Print view
First unread post

Moderator: Bunuel

Search for:


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®.

Main navigation

GMAT Resources

Partners

MBA Resources

www.gmac.com|www.mba.com