The difference between 39 and 20 is: 
The difference between 93 and 50 is: 
The difference between 33 and 20 is: 
The difference between 39 and 24 is: 
The difference between 39 and 20 is: 
The difference between 39 and 20 is: 
The difference between 47 and 28 is: 
The difference between 39 and 20 is: 