25% of the boys wear glasses. = (25/100)*8 = 0.25*8 = 2 boys wear glasses. 50% of the girls wear glasses. = (50/100)*12 = 0.50*12 = 6 girls wear glasses.
Total students that wear glasses = 2 + 6 = 8 students. 8 students wear glasses.
120 + 90 = 210 points 350 - 210 = 140 OR 351 - 210 = 141 (if it must be more than 350, you need <em>at least </em>351 points total, or 141 more points, to get a grade B)
