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401

Q:

The average of 30 numbers is 12. The average of the first 20 of them is 11 and that of the next 9 is 10. The last number is 

  • 1
    40
  • 2
    50
  • 3
    60
  • 4
    45
  • Show Answer
  • Workspace

Answer : 2. "50"

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