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

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Director
Joined: 11 Jun 2007
Posts: 932
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there are 12 blue balls and y yellows balls. what is the [#permalink]  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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SVP
Joined: 29 Aug 2007
Posts: 2497
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Re: probability question [#permalink]  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
Joined: 08 Jun 2005
Posts: 1147
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Re: probability question [#permalink]  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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2/5 = 12/(12+y)
y = 18

Perfect !!

CEO
Joined: 29 Mar 2007
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Re: probability question [#permalink]  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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# there are 12 blue balls and y yellows balls. what is the

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