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    Question

    What is the ratio of the number of books for subject B1

    to the average number of books per subject?  The given table shows the number of books on different subjects.  
    A 3 : 5 Correct Answer Incorrect Answer
    B 10 : 11 Correct Answer Incorrect Answer
    C 4 : 5 Correct Answer Incorrect Answer
    D 2 : 5 Correct Answer Incorrect Answer

    Solution

    Number of books for subject B1 = 120 Average number of books per subject = 660/5 = 132 Req ratio = 120:132 = 10:11

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