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    Question

    In a school, 40% of the students are girls, and 60% are

    boys. Half of the boys are enrolled in class 12, while the remaining 840 boys are in class 10. What is the total number of girls in the school?
    A Rs.1120 Correct Answer Incorrect Answer
    B Rs.2000 Correct Answer Incorrect Answer
    C Rs.2100 Correct Answer Incorrect Answer
    D Rs.1240 Correct Answer Incorrect Answer

    Solution

    ATQ;
    Let total population = 't'
    Boys = 60% of 't', Girls = 40% of 't'
    50% of the boys are enrolled in class 12,
    So, 50% are enrolled on class 10
    Number of boys who enrolled in class 10 = 0.50 × (0.60T) = 0.30T
    Given
    0.30t = 840
    Hence t = 840 ÷ 0.30 = 2800
    Number of girls = 40% of 2800 = 1120

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