Answer:
8 centimeters.
Step-by-step explanation:

Divide 3 both sides:

Multiply 4 on both sides:

8cm on the map represents 20km.
 
        
             
        
        
        
TeX rendering has been iffy at best on this site for the past few days, at least in my experience. I've attached a solution below.
 
        
             
        
        
        
Answer:
x would be 7
Step-by-step explanation:
2x7 = 14
14-3=11!
Hope I could help!
Brainlist??