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

It is currently 20 Aug 2014, 13:05

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

At a certain school, the ratio of the number of second

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 28 Jun 2007
Posts: 320
Followers: 1

Kudos [?]: 9 [0], given: 0

GMAT Tests User
At a certain school, the ratio of the number of second [#permalink] New post 02 Sep 2007, 09:24
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions
At a certain school, the ratio of the number of second graders to the number of fourth graders is 8 to 5, and the ratio of the number of first graders to the number of second graders is 3 to 4. If the ratio of the number of third graders to the number of fourth graders is 3 to 2, what is the ratio of the number of first graders to the number of third graders?
A. 16 to 15
B. 9 to 5
C. 5 to 16
D. 5 to 4
E. 4 to 5
Manager
Manager
avatar
Joined: 02 Jul 2007
Posts: 112
Followers: 1

Kudos [?]: 1 [0], given: 0

 [#permalink] New post 02 Sep 2007, 10:25
I get E

Second/Fourth=8/5 ----> 5(Second)=8(Fourth)
First/Second=3/4 -----> 4(First)=3(Second)
Third/Fourth=3/2 -----> 2(Third)=3(Fourth)

Want to find First/Third

2(Third)=3(Fourth) -> 2(Third)/3=Fourth
5(Second)=8(Fourth)-> 5(Second)=8[2(Third)/3] -> Second=16(Third)/15
4(First)=3(Second) -> 4(First)=3[16(Third)/15]

4(First)=[16(Third)/5]
First=[4(Third)/5]
First/Third=4/5
GMAT Club Legend
GMAT Club Legend
User avatar
Joined: 07 Jul 2004
Posts: 5097
Location: Singapore
Followers: 17

Kudos [?]: 136 [0], given: 0

GMAT Tests User
 [#permalink] New post 02 Sep 2007, 17:54
This question can be broken down as:
2nd:4th = 8:5
1st:2nd = 3:4
3rd:4th = 3:2
1st:3rd = ?:?

Then 1st/2nd * 2nd/4th = 1st/4th = 6/5
1st/4th * 4th/3rd = 1st/3rd = 6/5 * 2/3 = 4/5

Ans E
Manager
Manager
avatar
Joined: 03 Sep 2006
Posts: 233
Followers: 1

Kudos [?]: 5 [0], given: 0

GMAT Tests User
 [#permalink] New post 02 Sep 2007, 18:23
Q: 1st __ 2nd __ 3rd __ 4th

1) - __ 8 __ - __ 5
2) 3 __ 4 __ - __ - [to receive 2) from 1) we should devide 1) by 2]
so 3 __ 4 __ - __ 2*1/2
3) - __ - __ 3 __ 2 [to equalize 2) and 3) we need to *4/5 in order to receive 2 from 2*1/2]
so 12/5 __ 16/5 __ 3 __ 2 [multiplying by 5]
so 12 __ 16 __ 15 __ 10

1st/3rd = 12/15 = 4/5

Anw. is E
Director
Director
avatar
Joined: 30 Jun 2007
Posts: 793
Followers: 1

Kudos [?]: 103 [0], given: 0

GMAT Tests User
 [#permalink] New post 03 Sep 2007, 00:33
Let
N1 = Number of first graders
N2 = Number of second graders
N3 = Number of third graders
N4 = Number of fourth graders
Given:
N2 / N4 = 8/5
N1/N2 = 3/4
N3/N4 = 3/2
N1/N3 = N1/N2 * N2/N4 * N4/N3
= 3/4 * 8/5 * 2/3 = 4/5

Answer E
Director
Director
avatar
Joined: 22 Aug 2007
Posts: 573
Followers: 1

Kudos [?]: 11 [0], given: 0

GMAT Tests User
Re: PS - Set 1, Math 33 [#permalink] New post 03 Sep 2007, 01:08
gluon wrote:
At a certain school, the ratio of the number of second graders to the number of fourth graders is 8 to 5, and the ratio of the number of first graders to the number of second graders is 3 to 4. If the ratio of the number of third graders to the number of fourth graders is 3 to 2, what is the ratio of the number of first graders to the number of third graders?
A. 16 to 15
B. 9 to 5
C. 5 to 16
D. 5 to 4
E. 4 to 5


I got E

There is very good explanation above with N1, N2......s
Senior Manager
Senior Manager
avatar
Joined: 28 Jun 2007
Posts: 320
Followers: 1

Kudos [?]: 9 [0], given: 0

GMAT Tests User
 [#permalink] New post 03 Sep 2007, 06:18
OA is indeed E

That is an excellent explanation Hanumayamma. I have no idea why my brain froze while trying to do such a simple problem.
  [#permalink] 03 Sep 2007, 06:18
    Similar topics Author Replies Last post
Similar
Topics:
4 Experts publish their posts in the topic At a certain school, the ratio of the number of English carcass 2 30 Mar 2013, 08:49
8 Experts publish their posts in the topic At a certain school, the ratio of the number of second grade BANON 9 27 Feb 2012, 09:02
10 Experts publish their posts in the topic At a Certain school, the ratio of the number of second nickesha 12 16 Jul 2009, 10:59
At a certain school, the ratio of the number of second suntaurian 8 04 Feb 2008, 22:43
At a certain school, the ratio of the number of second M8 7 24 Apr 2006, 01:21
Display posts from previous: Sort by

At a certain school, the ratio of the number of second

  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®.