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    Question

    The average number of books read by 40 Indian students

    in a year is 30. If the books read by their librarian are included, the average increases by 2 books. Find the number of books read by the librarian.
    A 100 Correct Answer Incorrect Answer
    B 112 Correct Answer Incorrect Answer
    C 125 Correct Answer Incorrect Answer
    D 165 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Total books read by the students excluding librarian = 40 × 30 = 1200 Let the books read by the librarian be ‘b’. According to the question, (1200 + b) / (40 + 1) = 30 + 2 1200 + b = 41 × 32 1200 + b = 1312 b = 1312 – 1200 b = 112. So, the librarian read 112 books.

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