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# GmatPrep -Probability Q

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Intern
Joined: 27 Aug 2006
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GmatPrep -Probability Q [#permalink]  27 Sep 2006, 10:48
Someone pls explain this

thanks
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Proabability.doc [56 KiB]

Senior Manager
Joined: 15 Jul 2006
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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
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makes sense ..thanks
Current Student
Joined: 29 Jan 2005
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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
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this is a good example of plugging in nubmers...
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