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    Question

    In a class of boys and girls, the number of girls is

    twice the number of boys. If 30 mere boys join the class, the ratio of girls and boys is 1: 1. How many total students were there in the class initially?
    A 28 Correct Answer Incorrect Answer
    B 40 Correct Answer Incorrect Answer
    C 60 Correct Answer Incorrect Answer
    D 90 Correct Answer Incorrect Answer

    Solution

    Solution- In a class- Boys =x and Girls =2x ATQ- The ratio of girls and boys after joining 30 new boys- 2x /x+30 =1/1 2x =x+30 x =30 Total students in class =2x+x=3x =3×30=90

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