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    Question

    In class ‘D’, the number of girls is 50% of the number

    of boys. Class ‘E’ has 30% less number of boys than in class ‘D’ and 50% more total students than class ‘D’. What is the ratio of girls in class ‘D’ to girls in class ‘E’?
    A 7:13 Correct Answer Incorrect Answer
    B 10:31 Correct Answer Incorrect Answer
    C 9:5 Correct Answer Incorrect Answer
    D 3:5 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Let the number of boys in class ‘D’ = 100x

    Then, number of girls in class ‘D’ = 0.50 × 100x = 50x

    Number of boys in class ‘E’ = 0.70 × 100x = 70x

    Total number of students in class ‘E’ = (100x + 50x) × (150/100) = 225x

    Number of girls in class ‘E’ = 225x – 70x = 155x

    Required ratio = (50x):(155x) = 10:31

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