The difference between 97 and 20 is: 
The difference between 36 and 21 is: 
The difference between 94 and 20 is: 
The difference between 97 and 21 is: 
The difference between 77 and 20 is: 
The difference between 97 and 40 is: 
The difference between 102 and 25 is: 
The difference between 97 and 20 is: 