A + b = 45
a - b = 21
a = 21 + b
Use substitution 
21 + b + b = 45
2b = 24
b = 12
45 - 12 = 33
The numbers are 33 and 12
        
                    
             
        
        
        
Answer:
The third option (C) Yes, because there is enough water in the cooler for about 81 cups total.Step-by-step explanation:
 
        
                    
             
        
        
        
Answer:
D. 8/15
Step-by-step explanation:
 
        
                    
             
        
        
        
7900 79 times 100 ------------
        
                    
             
        
        
        
Answer:
b 
Step-by-step explanation:
 I pretty sure it b can u plz mark as brlainlest sorry if wrong try b