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    Question

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

    was 7:6 and total number of boys was 1960. When some more boys joined, the ratio became 8:7. Find the number of boys joined.
    A 70 Correct Answer Incorrect Answer
    B 40 Correct Answer Incorrect Answer
    C 50 Correct Answer Incorrect Answer
    D 60 Correct Answer Incorrect Answer
    E 45 Correct Answer Incorrect Answer

    Solution

    Boys: Girls = 7:6 Number of girls = 6/7×1960 = 1680 Let boys be added x. So, number of boys = 1960 + x According to the question, => (1960 + x)/1680 = 8/7 => 1960 + x = 1920 => x = 40

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