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Eighty percent of the lights at Hotel California are on at 8

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Eighty percent of the lights at Hotel California are on at 8 [#permalink] New post 23 Aug 2007, 14:10
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Eighty percent of the lights at Hotel California are on at 8 p.m. a certain evening. However, forty percent of the lights that are supposed to be off are actually on and ten percent of the lights that are supposed to be on are actually off. What percent of the lights that are on are supposed to be off?
22(2/9)%
16(2/3)%
11(1/9)%
10%
5%
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 [#permalink] New post 23 Aug 2007, 14:57
10% it is.

Horrible problem :(
  [#permalink] 23 Aug 2007, 14:57
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Eighty percent of the lights at Hotel California are on at 8

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