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    Question

    The number of students in class A is 25% more than the

    number of students in class B and the number of students in C is 20% more than the number of students in class A. If the ratio of then number of boys and girls in class A, B and C is 3: 2, 13: 7 and 12: 13 respectively, then the total number of girls in all the classes together is approximately what percent of the total number of students in all the classes together?
    A 43.5% Correct Answer Incorrect Answer
    B 47.5% Correct Answer Incorrect Answer
    C 53.22% Correct Answer Incorrect Answer
    D 22.5% Correct Answer Incorrect Answer

    Solution

    ATQ, Let the total number of students in class B = 4x Then, number of students in class A = 5x And number of students in class C = 6x Total number of girls in all three classes = 2/5 of 5x + 7/20 of 4x + 13/25 of 6x = 2x + 7x/5 + 78x/25 = 163x/25 = 163 ×( 4/15) = 43.46 ~ 43.5%

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