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      Question

      The average of a series of 30 numbers is 70. The

      difference between the largest number and the smallest number is 140. If the largest and the smallest number are excluded from the series, the average becomes 68. What is the largest number of the original series?
      A 168 Correct Answer Incorrect Answer
      B 155 Correct Answer Incorrect Answer
      C 110 Correct Answer Incorrect Answer
      D 172 Correct Answer Incorrect Answer

      Solution

      Sum of smallest and largest number = 30 × 70 – 28 × 68 = 196 Difference of smallest and largest number = 140 ∴ Largest number = (196 +140)/2 = 168

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