There are 48 students in class 6.3, of which 11 / 24 are girls. How many are boys?

There are 48 students in class 6.3, of which 11 / 24 are girls. How many are boys?

Since girls account for 11 / 24 of the class, boys account for 1-11 / 24 = 13 / 24
Because there are 48 students in the class, there are 48 boys in the class

In class 6 (3), there are 2 boys less than 3 / 5 of the class, and 11 / 25 of the class are girls. How many students are there in the class

2 (3 / 5 + 11 / 25-1) = 50 people

There were 52 students in class 6 (1), and then there were 4 girls. At this time, the number of girls was 3 / 4 of the number of boys. How many girls were there in class 6 (1)?
We need formulas, not equations. We need reasons

Let X be the number of boys,
If x + 3 / 4x = 52 + 4, then x = 32, that is, there are 32 boys, while there are 52 boys in the original class. Excluding 32 boys, there are 20 girls in class 6 (1)

There were 52 students in class 6 (1), and then 4 students were transferred in. At this time, the number of female students was 3 / 4 of the number of male students. How many female students were there in class 6 (1)?

There were 20 girls and 32 boys