The difference between 99 and 72 is: 
The difference between 17 and 15 is: 
The difference between 94 and 72 is: 
The difference between 99 and 72 is: 
The difference between 89 and 72 is: 
The difference between 99 and 32 is: 
The difference between 104 and 77 is: 
The difference between 99 and 72 is: 