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    Question

    Total number of students in a class is 2160, and the

    ratio of number of boys to girls is 2:3. If the number of boys and girls is increased by b% and (b – 6)% respectively, then the total number of students in the class will become 2430. Find the value of b.(Can calculate approx. value)
    A 35.2% Correct Answer Incorrect Answer
    B 16.1% Correct Answer Incorrect Answer
    C 27.5% Correct Answer Incorrect Answer
    D 25.1% Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Number of boys in the class before increase = (2/5) ×2160=864 Number of girls in the class before increase = 2160 – 864 = 1296 According to the question: So, the value of b is approximately 16.1%.

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