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Q: The average of 21 number is 66. The average of first 9 numbers is 63.7 and the average of last 13 numbers is 69.9. If 9th number is put out, what is the average of remaining number?
  • A. 64
  • B. 63
  • C. 64.5
  • D. 63.5
Correct Answer: Option C -
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Explanations:

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