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    Question

    The average weight of 20 boys is 60 kg and the average

    weight of 30 girls is 55 kg. Find the average weight of all 50 students together.
    A 44 kg Correct Answer Incorrect Answer
    B 57 kg Correct Answer Incorrect Answer
    C 37 kg Correct Answer Incorrect Answer
    D 42 kg Correct Answer Incorrect Answer

    Solution

    Total weight of boys = 20 × 60 = 1,200 kg Total weight of girls = 30 × 55 = 1,650 kg Combined total = 1,200 + 1,650 = 2,850 kg Total students = 20 + 30 = 50 Average = 2,850 / 50 = 285/5 = 57 kg Answer: 57 kg.

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