a class has girls and boys in the ratio 4:6.among the girl the ratio of maths to physics student is 3:1. if the ratio of the maths to physics student in the Entire class is 3:2 what percent of the class comprise girls studying math
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Let us assume that the total number of student in the class is 90.
According to the given condition, Girl:Boy=4:5
4x+5x=90
9x=90
x=10
So the number of girls is 40 and the number of boys is 50.
Now, according to the second condition ratio of mathematics to physics is 3:1 for girls.
So, 3x+x=40
4x=40
x=10
So, the number of girls studying physics is 10 and mathematics is 30.
So, the number of girls studying physics to the total number of girls is 10/40
So, percentage =(10/40)*100 =25%
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