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# At a certain theater, the cost of each adults ticket is $5  post reply Question banks Downloads My Bookmarks Reviews Important topics Author Message Senior Manager Joined: 17 Jul 2007 Posts: 288 Location: The 408 Followers: 3 Kudos [?]: 3 [0], given: 0 At a certain theater, the cost of each adults ticket is$5 [#permalink]

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08 Sep 2007, 13:45
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At a certain theater, the cost of each adults ticket is $5 and the cost of each childs ticket is$2. What is the average cost of all the adults and chilren's tickets sold at the theater yesterday?

1) yesterday the ratio of the number of childrens tickets sold at the theater to the number of adults tickets sold was 3 to 2

2) yesterday 80 adults tickets were sold at the theater

OA is A, but why?
Manager
Joined: 09 Dec 2006
Posts: 96
Followers: 1

Kudos [?]: 18 [0], given: 0

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08 Sep 2007, 14:37
zakk wrote:
At a certain theater, the cost of each adults ticket is $5 and the cost of each childs ticket is$2. What is the average cost of all the adults and chilren's tickets sold at the theater yesterday?

1) yesterday the ratio of the number of childrens tickets sold at the theater to the number of adults tickets sold was 3 to 2

2) yesterday 80 adults tickets were sold at the theater

OA is A, but why?

Because they ask us "the average cost", so we don't need definite numbers, ratio is enough.
Re: GMATPrep: DS   [#permalink] 08 Sep 2007, 14:37
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