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    Question

    Average number of pages in 54 books is 240. Two more

    books with pages (b + 20) and (b - 8) are added, and the average becomes 242. Find (b - 100).
    A 180 Correct Answer Incorrect Answer
    B 160 Correct Answer Incorrect Answer
    C 190 Correct Answer Incorrect Answer
    D 200 Correct Answer Incorrect Answer

    Solution

    56 × 242 − 54 × 240 = b + 20 + b − 8
    2b + 12 = 13,552 − 12,960 = 592
    2b = 580
    b = 290
    b − 100 = 290 – 100 = 190

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