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from a bag containing 12 identical blue balls, y identical

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from a bag containing 12 identical blue balls, y identical [#permalink] New post 22 Aug 2006, 11:47
from a bag containing 12 identical blue balls, y identical yellow balls and no other balls, one ball will be removed at random. If the probability is less than 2/5 that the removed ball will be blue, what is the least number of yellow balls that must be in the bag?

17
18
19
20
21

Last edited by lan583 on 11 Feb 2007, 07:52, edited 1 time in total.
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 [#permalink] New post 22 Aug 2006, 12:08
19 (c)

Since probability is less than 2/5, 12 must be less than 40% of the balls. So there must be at least 60% + 1 yellow balls.
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 [#permalink] New post 22 Aug 2006, 12:24
agree with paddyboy... 19 it is

Let T be the total number of balls

12/T <2 /5

i.e. T>30

i.e. 12 + y > 30

y>18

Hence C
  [#permalink] 22 Aug 2006, 12:24
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from a bag containing 12 identical blue balls, y identical

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