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    Question

    In a class, the ratio of number of boys to that of girls

    was 5:4 and total number of boys was 1125. When some more boys joined, the ratio became 6:5. Find the number of boys joined.
    A 45 Correct Answer Incorrect Answer
    B 55 Correct Answer Incorrect Answer
    C 60 Correct Answer Incorrect Answer
    D 78 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Boys : Girls = 5:4 Number of girls = 4/5 × 1125 = 900 Let boys be added x. So, number of boys = 1125 + x According to the question, => (1125 + x)/900 = 6/5 => 1125 + x = 1080 => x = 45

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