.48x =36 x=36/.48 x=75 So the total distance to kirk's grandmother's house was 75 miles
        
                    
             
        
        
        
I think the answer is 816cm
        
             
        
        
        
I will set it up for you only.
Let a = adult tickets
Let s = student tickets
Here is your system of equations:
a + s = 800
12a + 8s = 7500