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

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Manager
Joined: 09 Dec 2006
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Eighty percent of the lights at Hotel California are on at 8 [#permalink]

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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%
Manager
Joined: 22 May 2007
Posts: 121
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23 Aug 2007, 14:57
10% it is.

Horrible problem
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