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    Question

    The average weight of a group of people is 62 kg. A person

    weighing 80 kg joins the group and the average increases by 1 kg. Find the total weight of the group before the new person joined.
    A 1054 Correct Answer Incorrect Answer
    B 1020 Correct Answer Incorrect Answer
    C 1070 Correct Answer Incorrect Answer
    D 1100 Correct Answer Incorrect Answer
    E 1000 Correct Answer Incorrect Answer

    Solution

    Let the number of people before joining be 'P'.

    Weight before = 62P

    (62P + 80) / (P + 1) = 63
    => 62P + 80 = 63P + 63
    => P = 17

    Total weight = 62 ├Ч 17 = 1054 kg

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