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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 number 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?

  • 1
    76
  • 2
    76.5
  • 3
    77
  • 4
    77.5
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Answer : 3. "77"

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