New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    The average score of a class of boys and girls in

    examination is X. The ratio of boys and girls in the class is 4:3. If the average score of the boys (X + 2), the average score of the girls is:
    A (3X + 2) / 3 Correct Answer Incorrect Answer
    B (3x – 7) / 3 Correct Answer Incorrect Answer
    C (3X - 8) / 3 Correct Answer Incorrect Answer
    D (3X - 2) / 3 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let there be 4n boys and 3n  girls Total score = (4n + 3n) X = 7nX Total score of boys = 4n(X + 2) = 4nX + 8n Total score of girls = 7nX – (4nX + 8n)  = (3nX – 8n)  Average score of girls = ((3nX – 8n))/3n  =  (3X - 8)/3

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