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# GmatPrep -Probability Q

Author Message
Intern
Joined: 27 Aug 2006
Posts: 32

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27 Sep 2006, 11:48
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

Someone pls explain this

thanks
Attachments

Proabability.doc [56 KiB]

Senior Manager
Joined: 15 Jul 2006
Posts: 381

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27 Sep 2006, 12:44
OK,

we know that 12/x <2/5 where x = 12+y

multiply by 5 both sides:
60/x<2 so x has to be >30

30<12+y
so y has to be greater than 18, so answer is 19
Intern
Joined: 27 Aug 2006
Posts: 32

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27 Sep 2006, 12:48
makes sense ..thanks
Current Student
Joined: 29 Jan 2005
Posts: 5218

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27 Sep 2006, 19:42
EconGirl wrote:
OK,

we know that 12/x <2/5 where x = 12+y

multiply by 5 both sides:
60/x<2 so x has to be >30

30<12+y
so y has to be greater than 18, so answer is 19

Used a similiar method:

12-blue / y-yellow

2/5x=12

x>30 total balls

30-12= 18 (but it must be greater per the stem)

19
Manager
Joined: 13 Sep 2006
Posts: 212

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27 Sep 2006, 20:48
this is a good example of plugging in nubmers...
27 Sep 2006, 20:48
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