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    Question

    The average weight of 20 students is 27 kg. If two

    students weighing 19 kg and 47 kg are replaced by a teacher weighing 77 kg, what is the new average weight?
    A 29 kg Correct Answer Incorrect Answer
    B 28.5 kg Correct Answer Incorrect Answer
    C 27 kg Correct Answer Incorrect Answer
    D 27.5 kg Correct Answer Incorrect Answer

    Solution

    Total weight of all the students in the class, initially = 20 X 27 = 540 kg New total weight of the class = 540 - (19 + 47) + 77 = 551 kg So, new average weight of each student in the class = 551 ÷ 19 = 29 kg

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