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      Question

      While listing N consecutive even numbers for determining

      their average, the last number, by mistake, got replaced by the next odd number and thereby the average turned out to be more than the desired value by 0.0125. What is the value of N?
      A 80 Correct Answer Incorrect Answer
      B 40 Correct Answer Incorrect Answer
      C 50 Correct Answer Incorrect Answer
      D 100 Correct Answer Incorrect Answer

      Solution

      According to the question, Last number is Nth + 1 Difference of present and actual should be 1 ∵ last number is the next odd digit of that even digit, Now, For difference average change by 1/N Here, 1/N = 0.0125 ⇒ N = 1/0.0125 ⇒ 10000/125 ⇒ 80 ∴The value of N is 80

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