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Q:

The average of 5 numbers, arranged in a row, is 309. The average of the first two of these numbers is 431 and the average of the last two of these numbers is 231.5. What is the value of the number at the center of the row?

  • 1
    321
  • 2
    52
  • 3
    108
  • 4
    220
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Answer : 4. "220"

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