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Suppose that in the Baltimore metro area, 25% of the crimes

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Suppose that in the Baltimore metro area, 25% of the crimes [#permalink] New post 16 Oct 2005, 05:32
Suppose that in the Baltimore metro area, 25% of the crimes occur during the day and 80% of the crimes occur in the city. If only 10% of the crimes occur outside the city during the day, what percent occur outside the city during the night?

A 10%
B 12%
C 20%
D 22%
E Not enough information provided
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 [#permalink] New post 16 Oct 2005, 05:52
Seems like a trick problem. Let 100= total number of crimes committed.

20 occur outside the city, (100*.20). Half occur during the day (10) so the other half must occur during the night (20-10=10).

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 [#permalink] New post 16 Oct 2005, 06:30
The answer is 10%. This problem is easily solved by drawing a table and using 100 as a trial value since we're dealing with percentages. Please see my attachement for the solution.
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 [#permalink] New post 16 Oct 2005, 07:22
That's correct, OA is A
  [#permalink] 16 Oct 2005, 07:22
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Suppose that in the Baltimore metro area, 25% of the crimes

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