AMC 10A 2005 Problem 6

Past Contests AMC 10 AMC 10A - 2005
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1

The average (mean) of 20 numbers is 30 , and the average of 30 other numbers is 20 . What is the average of all 50 numbers?

Answer Choices
A. 23
B. 24
C. 25
D. 26
E. 27