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    Question

    In a class of 40 students, the

    average weight of the class is 65 kg, but when one of the students left from the school and 6 new students joined the class such that the average weight of the class becomes 64.8 kg. What is the weight of a student who is 3 kg more than the weight of the student who left from the school, if the total weight of six new students who joined the class is 390 kg?
    A 49 kg Correct Answer Incorrect Answer
    B 55 kg Correct Answer Incorrect Answer
    C 77 kg Correct Answer Incorrect Answer
    D 63 kg Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Sum of weight of class = 40 * 65 = 2600 2600 - x + 390 = 64.8 * 45 2990 - x = 2916 x = 74 Required weight of the student = 74 + 3 = 77 kg

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