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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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