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    Question

    The average weight of 10 books is 5 kg. If 6 new books

    are added, the new average increases by 3 kg. What will be the average weight of the 6 new books?
    A 13 kg Correct Answer Incorrect Answer
    B 10 kg Correct Answer Incorrect Answer
    C 11 kg Correct Answer Incorrect Answer
    D 14 kg Correct Answer Incorrect Answer
    E 12 kg Correct Answer Incorrect Answer

    Solution

    Total books = 10 + 6 = 16 books Increment in average = 5 + 3 = 8 kg Now, Weight of 18 new books = (16 × 8) – (10 × 5) = 78 kg ∴ Required average = 78/6 = 13 kg

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