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Q: The average of eighteen number is 42. The average of the last ten numbers is 40 and that of the first five numbers is 44. The seventh number is 6 less than the sixth and 7 less than the eighth number. The average of the sixth and the eighth number is:
  • A. 46.5
  • B. 48
  • C. 47.5
  • D. 45
Correct Answer: Option C -
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Explanations:

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