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    Question

    A class of 30 students appeared in a test. The average

    score of 12 students is 80, and that of the rest is 75. What is the average score of the class?
    A 56 Correct Answer Incorrect Answer
    B 67 Correct Answer Incorrect Answer
    C 87 Correct Answer Incorrect Answer
    D 77 Correct Answer Incorrect Answer

    Solution

    To find the average score of the entire class, Calculate the total score of the first group (12 students with an average score of 80) = 12×80 = 960 Calculate the total score of the second group (18 students with an average score of 75) = 18×75 = 1350 Add the total scores of both groups = 960+1350 = 2310 Divide the total score by the total number of students (30) = 2310/30 = 77

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