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      Question

      The average of 11 observations is 60. If the average of

      first five observations is 58 and that of last five is 56, the sixth observation is
      A 90 Correct Answer Incorrect Answer
      B 110 Correct Answer Incorrect Answer
      C 85 Correct Answer Incorrect Answer
      D 100 Correct Answer Incorrect Answer

      Solution

      Average of 11 observations = 60

      Average of first 5 observations = 58

      Average of last 5 observations = 56


      Total of 11 observations=11×60=660


      Total of first 5 observations=5×58=290


      Total of last 5 observations=5×56=280

      Now, add the total of the first 5 and last 5: 290 + 280 = 570
      Required answer = 660 − 570 = 90 ​

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