Answer:
1 cm = 20 km
so 3.5 cm would equal : 3.5 * 20 = 70 km 
 hope it helps ;)
Step-by-step explanation:
 
        
             
        
        
        
This is the symmetric property, for you divide 9 to both sides to get x, instead of adding (addition property of equality) 
So symmetric property should be your answer
Hope this helps
        
                    
             
        
        
        
50% of 40 is 20, and 40% of 50 is 20, neither one is greater, they're equal