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 = 0.25*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.
        
             
        
        
        
KCC
7 units 7-4=3 (-9)-(-5)=
 -9+5=(-4)
 3+(-4)= 7
        
                    
             
        
        
        
Answer:
work is shown and pictured
 
        
             
        
        
        
All you have to do is divide 433.44 by the price of the hamburgers, so 
433.44 ÷ 3.87 = 112
The answer is 112 (: