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    Question

    Average weight of all the people in a group is 55 kg.

    When two people of weight 63 kg and 77 kg left the group, average weight reduces by 1.5 kg. Find the number of people in the group now.
    A 20 Correct Answer Incorrect Answer
    B 24 Correct Answer Incorrect Answer
    C 22 Correct Answer Incorrect Answer
    D 18 Correct Answer Incorrect Answer

    Solution

    Let the number of people initially be 'n'.

    So, 55n - 53.5 × (n - 2) = 63 + 77

    Or, 55n - 53.5n + 107 = 140

    Or, 1.5n = 33

    Or, 'n' = 22

    Required number of people = 22 - 2 = 20

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