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

 It is currently 25 Apr 2015, 19:19

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

from a bag containing 12 identical blue balls, y identical

Author Message
TAGS:
Manager
Joined: 05 Jul 2006
Posts: 198
Followers: 1

Kudos [?]: 20 [0], given: 0

from a bag containing 12 identical blue balls, y identical [#permalink]  22 Aug 2006, 11:47
from a bag containing 12 identical blue balls, y identical yellow balls and no other balls, one ball will be removed at random. If the probability is less than 2/5 that the removed ball will be blue, what is the least number of yellow balls that must be in the bag?

17
18
19
20
21

Last edited by lan583 on 11 Feb 2007, 07:52, edited 1 time in total.
Director
Joined: 06 May 2006
Posts: 781
Followers: 3

Kudos [?]: 16 [0], given: 0

19 (c)

Since probability is less than 2/5, 12 must be less than 40% of the balls. So there must be at least 60% + 1 yellow balls.
Senior Manager
Joined: 14 Jul 2005
Posts: 402
Followers: 1

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

agree with paddyboy... 19 it is

Let T be the total number of balls

12/T <2 /5

i.e. T>30

i.e. 12 + y > 30

y>18

Hence C
Similar topics Replies Last post
Similar
Topics:
8 A bag contains ten marbles of the same size: 3 are identical green mar 9 29 Jan 2015, 10:48
3 A certain bag contains only red balls, blue balls, and green 1 27 Jul 2014, 15:24
there are 12 blue balls and y yellows balls. what is the 3 04 Nov 2007, 20:30
You have 12 balls. All of them are identical except one, 4 03 Jan 2007, 00:07
9 From a bag containing 12 identical blue balls, y identical 10 06 Apr 2006, 14:32
Display posts from previous: Sort by