Well 6×12=72. I don't know what the original tank size was but subtract the original from this one to get your answer.
        
             
        
        
        
Answer:
B. 345
Step-by-step explanation:
Hope this helps!
 
        
                    
             
        
        
        
Answer:
799
Step-by-step explanation:
Let x = the hundreds digit
Let y = the ones digit
x = y-2
We want to maximize x and y.  The both have to be single digit numbers
Rewriting this
x+2 =y
The largest x can be is 7 if y is a single digit
x is 7 and y is 9
We can pick the tens digit.  Make it as big as possible to make out number as large as possible
799
 
        
             
        
        
        
Answer:
2
Step-by-step explanation:
 
        
             
        
        
        
Subtracting whole numbers does not include subtracting negative numbers, whereas when subtracting integers you can include negative numbers.