There are 442 boy students in class

b. if 15% of the students are girls, find the total number of students in class b

Let, the total number of students = x

percentage of boys = 100-15 = 85%

Now, you have to calculate that whose number's 85% is equal to 442

So, it would be x*85/100 = 442

x = 44200/85

x = 520

So, the total number of students in the classroom is 520