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    Question

    Total number of students in a class is 1920, and the

    ratio of number of boys to girls is 7:9. If the number of boys and girls is increased by a% and (a – 2)% respectively, then the total number of students in the class will become 2208. Find the value of a.(Can calculate approx. value)
    A 35.22% Correct Answer Incorrect Answer
    B 16.13% Correct Answer Incorrect Answer
    C 27.15% Correct Answer Incorrect Answer
    D 25.16% Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Number of boys in the class before increase = (7/16) ×1920=840 Number of girls in the class before increase = 1920 – 840 = 1080 According to the question: So, the value of a is approximately 16.13%.

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