20 students.
40% are boys. (40/100)20 = 0.4 20 = 8 boys.
Girls= 20 - 8 = 12 girls.
25% of the boys wear glasses. = (25/100)8 = 0.258 = 2 boys wear glasses.
50% of the girls wear glasses. = (50/100)12 = 0.5012 = 6 girls wear glasses.
Total students that wear glasses = 2 + 6 = 8 students.
8 students wear glasses.
