The difference between 91 and 50 is: 
The difference between 53 and 39 is: 
The difference between 93 and 50 is: 
The difference between 91 and 50 is: 
The difference between 81 and 50 is: 
The difference between 91 and 20 is: 
The difference between 100 and 59 is: 
The difference between 91 and 50 is: 