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    Question

    The combined average weight of 8 copies and 5 books is

    150 grams. If the average weight of the copies is 180 grams, find the average weight of the books.
    A 94 Correct Answer Incorrect Answer
    B 102 Correct Answer Incorrect Answer
    C 108 Correct Answer Incorrect Answer
    D 114 Correct Answer Incorrect Answer

    Solution

    Total weight of 8 copies and 5 books = 13×150 = 1950 Weight of 8 copies = 8×180 = 1440 Weight of 5 books = 1950 – 1440 = 510 Average weight of 5 books = 510/5 = 102 grams

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