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

It is currently 01 Oct 2014, 10:36

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

There are 20 purple balls and 30 yellow balls in box A.

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:
Senior Manager
Senior Manager
avatar
Joined: 07 Nov 2004
Posts: 459
Followers: 2

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

There are 20 purple balls and 30 yellow balls in box A. [#permalink] New post 13 Apr 2005, 13:40
There are 20 purple balls and 30 yellow balls in box A. There are 15 purple balls and 35 yellow balls in box B. What is the probability that one ball selected randomly from the 2 box is purple?
VP
VP
avatar
Joined: 30 Sep 2004
Posts: 1493
Location: Germany
Followers: 4

Kudos [?]: 52 [0], given: 0

 [#permalink] New post 13 Apr 2005, 13:49
20/50+15/50=35/50=7/10
_________________

If your mind can conceive it and your heart can believe it, have faith that you can achieve it.

Senior Manager
Senior Manager
avatar
Joined: 07 Nov 2004
Posts: 459
Followers: 2

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

 [#permalink] New post 13 Apr 2005, 14:24
close but no there yet :-D
Director
Director
avatar
Joined: 27 Dec 2004
Posts: 910
Followers: 1

Kudos [?]: 12 [0], given: 0

 [#permalink] New post 13 Apr 2005, 14:44
i also got 7/10.

Let me try again
Director
Director
avatar
Joined: 18 Feb 2005
Posts: 674
Followers: 1

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

Re: Probability, Balls [#permalink] New post 13 Apr 2005, 14:55
DLMD wrote:
There are 20 purple balls and 30 yellow balls in box A. There are 15 purple balls and 35 yellow balls in box B. What is the probability that one ball selected randomly from the 2 box is purple?


1/2(20/50 + 15/50) = 7/20
Director
Director
avatar
Joined: 27 Dec 2004
Posts: 910
Followers: 1

Kudos [?]: 12 [0], given: 0

Re: Probability, Balls [#permalink] New post 13 Apr 2005, 15:09
gmat2me2 wrote:
DLMD wrote:
There are 20 purple balls and 30 yellow balls in box A. There are 15 purple balls and 35 yellow balls in box B. What is the probability that one ball selected randomly from the 2 box is purple?


1/2(20/50 + 15/50) = 7/20


pls explain the 1/2.
Thanks
Director
Director
avatar
Joined: 18 Feb 2005
Posts: 674
Followers: 1

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

Re: Probability, Balls [#permalink] New post 13 Apr 2005, 15:23
Folaa3 wrote:
gmat2me2 wrote:
DLMD wrote:
There are 20 purple balls and 30 yellow balls in box A. There are 15 purple balls and 35 yellow balls in box B. What is the probability that one ball selected randomly from the 2 box is purple?


1/2(20/50 + 15/50) = 7/20


pls explain the 1/2.
Thanks


2 boxes from which we need to select one purple ball

So select the box first = 1/2
Intern
Intern
avatar
Joined: 15 Feb 2005
Posts: 23
Followers: 0

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

 [#permalink] New post 13 Apr 2005, 20:27
As I understand it, we are selecting just one purple ball from both the boxes together.

So it would be

(20+15)/(50+50) = 35/100 = 7/20
VP
VP
User avatar
Joined: 25 Nov 2004
Posts: 1498
Followers: 6

Kudos [?]: 31 [0], given: 0

 [#permalink] New post 13 Apr 2005, 20:56
aks720 wrote:
As I understand it, we are selecting just one purple ball from both the boxes together. So it would be (20+15)/(50+50) = 35/100 = 7/20


nice one. or alternatively, 0.5(20/50)+0.5(15/50)=1/5+3/20=7/20.
  [#permalink] 13 Apr 2005, 20:56
    Similar topics Author Replies Last post
Similar
Topics:
Experts publish their posts in the topic A box contains 3 yellow balls and 5 black balls. One by one gmativy 2 08 Dec 2010, 18:20
14 Experts publish their posts in the topic A box contains 3 yellow balls and 5 black balls. One by one dmetla 16 09 Feb 2010, 21:00
19 Experts publish their posts in the topic A box contains 3 yellow balls and 5 black balls. One by one tejal777 22 29 Sep 2009, 00:14
One box contains 30 purple balls and 20 red balls, another jamesrwrightiii 1 25 Aug 2007, 23:35
One box contains 30 purple balls and 20 red balls, another johnycute 3 08 Nov 2006, 15:39
Display posts from previous: Sort by

There are 20 purple balls and 30 yellow balls in box A.

  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®.