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Q: The average of ten numbers is 72. The average of the first four numbers is 69 and that of the next three numbers is 74. The 8th number is 6 more than the 9th number and 12 more than the 10th number. What is the average of the 8th and 9th numbers?
  • A. 76
  • B. 77.5
  • C. 76.5
  • D. 77
Correct Answer: Option D -
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Explanations:

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