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GmatPrep -Probability Q

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GmatPrep -Probability Q [#permalink] New post 27 Sep 2006, 10:48
Someone pls explain this

thanks
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 [#permalink] New post 27 Sep 2006, 11:44
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
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 [#permalink] New post 27 Sep 2006, 11:48
makes sense ..thanks
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 [#permalink] New post 27 Sep 2006, 18:42
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
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 [#permalink] New post 27 Sep 2006, 19:48
this is a good example of plugging in nubmers...
  [#permalink] 27 Sep 2006, 19:48
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GmatPrep -Probability Q

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