ANSWER:
There are 36 girls in a class when there are 48 boys
SOLUTION:
Given, ratio of number of girls to number of boys is 3 to 4.
Ratio proportion for above condition is given as
Number of girls : Number of boys : : 3 : 4
Ratio proportion can also be written as
--- eqn 1
Now, given that, find how many girls, when there are 48 boys in the class.
From eqn 1 we have




No. of girls = 36.
Hence, there are 36 girls in a class when there are 48 boys