Example 2: A school has 500 students, 320 female students and 380 male students who do not wear eyeglasses. If there are 50 male students who wear eyeglasses, how many female students will wear eyeglasses?
The second example: a school has 500 students, 320 girls, 380 boys without glasses, and if there are boys with glasses. How many girls among 50 students wear glasses?
There are 500 students in a school, including 320 female students and 380 male students who don't wear glasses. If 50 male students wear glasses, how many female students wear glasses?