C is my answer of ask other sources tho. Ok
        
             
        
        
        
In About 13 days the water in the tank will hit 6000 gallons
        
             
        
        
        
2x+5y=21, x+y=3
y=3-x
2x+5y=21
2x+5(3-x) =21
2x+15-5x=21
2x-5x+15=21
-3x+15=21
-3x=21-15
-x=6/3
-x=2
x=-2
        
             
        
        
        
i could tell you what n is if you tell me what t is
sorry not much help 
 
        
                    
             
        
        
        
Answer:
Area of A = 32ft
Area of B = 36ft
Step-by-step explanation:
All you need to do to solve is multiply width * length * height.
If you do so, 
Area of A = 3 * 2 * 5 1/3 
= 6 * 16/3
= 32
Area of B = 6 * 4 * 1 1/2 
= 24 * 3/2
= 36
Hope this helps!!
Let me know if I'm wrong or you need help in any other problem!!