Question
In a class of boys and girls, the number of girls is
twice the number of boys. If 20 mere boys join the class, the ratio of girls and boys is 1 : 1. How many total students were there in the class initially?Solution
In a class- Boys =x and Girls =2x ATQ- The ratio of girls and boys after joining 20 new boys- 2x /x+20 =1/1 2x =x+20 x =20 Total students in class =2x+x=3x =3×20=60 Â
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