Answer:
f(1)=94,f(n)=f(n-1)-5
Step-by-step explanation:
 
        
             
        
        
        
1 gallon of milk is the better deal. A gallon is 4 quarts, so for 2 quarts, it would be left. I hope I helped!
        
                    
             
        
        
        
I’m pretty sure there are infinite solutions as the system of equations are equivalent to each other.