Difference between revisions of "2004 AMC 8 Problems/Problem 9"
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Revision as of 01:02, 12 March 2012
Problem
The average of the five numbers in a list is . The average of the first two numbers is . What is the average of the last three numbers?
Solution
Let the numbers be , and . Thus and . Since , . Substituting back into our original equation, we have and . Dividing by gives the average of