The difference between 30 and 20 is: 
The difference between 25 and 11 is: 
The difference between 37 and 20 is: 
The difference between 30 and 20 is: 
The difference between 40 and 20 is: 
The difference between 30 and 20 is: 
The difference between 32 and 23 is: 
The difference between 30 and 20 is: 