question: In a certain school, two classes have a total of 80 students. Each class has the same amount of students, and in each class 40% of the students are girls. How many boys are in each class?
answer: If both classes have the same amount of students, that means each of them has 80 / 2 = <<80/2=40>>40 students.
  The girls in each class make up to 40%, so there are 40/100 * 40 = <<40/100*40=16>>16 girls in each of them.
  That means the rest of the class are boys, so there are 40 - 16 = <<40-16=24>>24 boys in each class.
  #### 24