Civil Service Exam Reviewer · Averages · hard
The average of 11 numbers is 40. The average of the first 6 is 44, and the average of the last 6 is 39. What is the middle (6th) number?
- 40
- 58
- 42
- 64
Answer
B. 58
Solution
First 6 sum = 264; last 6 sum = 234. Together they count the middle number twice: 498 − 440 = 58.
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