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there are 12 blue balls and y yellows balls. what is the

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Director
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Joined: 11 Jun 2007
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there are 12 blue balls and y yellows balls. what is the [#permalink] New post 04 Nov 2007, 20:30
there are 12 blue balls and y yellows balls. what is the minimum number of yellows balls so that the probability of picking a blue ball is 2/5?

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CEO
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Re: probability question [#permalink] New post 04 Nov 2007, 20:40
beckee529 wrote:
there are 12 blue balls and y yellows balls. what is the minimum number of yellows balls so that the probability of picking a blue ball is 2/5?

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2/5 = 12/(12+y)
y = 18
VP
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Re: probability question [#permalink] New post 04 Nov 2007, 21:03
GMAT TIGER wrote:
beckee529 wrote:
there are 12 blue balls and y yellows balls. what is the minimum number of yellows balls so that the probability of picking a blue ball is 2/5?

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18
19
20
21


2/5 = 12/(12+y)
y = 18


Perfect !!

:)
CEO
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Re: probability question [#permalink] New post 04 Nov 2007, 22:41
beckee529 wrote:
there are 12 blue balls and y yellows balls. what is the minimum number of yellows balls so that the probability of picking a blue ball is 2/5?

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Id say B.

12/12+Y=2/5 --> 60=24+2y

y=18.
Re: probability question   [#permalink] 04 Nov 2007, 22:41
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