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    Question

    The average weight of 30 students in a class increases

    by 0.5 kg when the weight of the principal is included. If earlier the average weight of the students was 50 kg, then find the weight of the principal.
    A 65.5 kg Correct Answer Incorrect Answer
    B 55.7 kg Correct Answer Incorrect Answer
    C 58.5 kg Correct Answer Incorrect Answer
    D 88.8 kg Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Total weight of the students (Excluding the weight of the principal) = 30 × 50 = 1500 kg New total weight of the students = 31 × (50 + 0.5) = 31 × 50.5 = 1565.5 kg So, weight of the principal = 1565.5 - 1500 = 65.5 kg

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