The difference between 91 and 20 is: 
The difference between 95 and 83 is: 
The difference between 97 and 20 is: 
The difference between 91 and 20 is: 
The difference between 31 and 20 is: 
The difference between 91 and 30 is: 
The difference between 100 and 29 is: 
The difference between 91 and 20 is: 