2005 AMC 10A Problems/Problem 6
Contents
[hide]Problem
The average (mean) of numbers is , and the average of other numbers is . What is the average of all numbers?
Solution
Since the average of the first numbers is , their sum is .
Since the average of other numbers is , their sum is .
So the sum of all numbers is
Therefore, the average of all numbers is
Video Solution
~Charles3829
See also
2005 AMC 10A (Problems • Answer Key • Resources) | ||
Preceded by Problem 5 |
Followed by Problem 7 | |
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All AMC 10 Problems and Solutions |
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