The difference between 99 and 15 is: 
The difference between 47 and 17 is: 
The difference between 98 and 15 is: 
The difference between 99 and 15 is: 
The difference between 79 and 15 is: 
The difference between 99 and 85 is: 
The difference between 102 and 18 is: 
The difference between 99 and 15 is: 