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

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Manager
Joined: 14 Dec 2004
Posts: 117

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Suppose that in the Baltimore metro area, 25% of the crimes [#permalink]

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16 Oct 2005, 05:32
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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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Current Student
Joined: 29 Jan 2005
Posts: 5206

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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).

A.

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GMAT Club Legend
Joined: 07 Jul 2004
Posts: 5034

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Location: Singapore

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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.
Attachments

table.ppt [94.5 KiB]

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Manager
Joined: 14 Dec 2004
Posts: 117

Kudos [?]: 67 [0], given: 0

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16 Oct 2005, 07:22
That's correct, OA is A

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16 Oct 2005, 07:22
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