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An averages question : GRE Math Doubts, Quant Questions Discussions

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meera
 Post subject: An averages question
PostPosted: Tue May 30, 2006 5:55 pm 
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Learning the ABCs

Joined: Thu May 25, 2006 8:34 am
Posts: 7
There are 11 consecutive odd integers. If the average of the first 7 is "n", then what is the average of all 11.

Answers given in terms of "n"
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topgre
 Post subject: Use number examples
PostPosted: Sat Jun 03, 2006 1:27 pm 
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Joined: Tue May 23, 2006 8:41 pm
Posts: 19
The quickest way to solve such questions is to take numerical values.

11 consecutive odd integers can be
1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21.

First 7 amongst these 11 odd integers are 1, 3, 5, 7, 9, 11, 13. Average of these 7 odd integers is 7. The question states the value of the average is "n"

The average of all 11 odd integers is 11.

If 7 = n, then 11 = n + 4.
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