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2011 AMC 8 Problems/Problem 11

Revision as of 21:41, 3 January 2012 by Aallen (talk | contribs) (Created page with "Average the differences between the two times. 10, -10, 20, 30, -20 The sum is 30. Divide by 5 = 6.")
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Average the differences between the two times. 10, -10, 20, 30, -20 The sum is 30. Divide by 5 = 6.

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