The difference between 59 and 55 is: 
The difference between 60 and 58 is: 
The difference between 59 and 55 is: 
The difference between 59 and 58 is: 
The difference between 79 and 55 is: 
The difference between 59 and 15 is: 
The difference between 61 and 57 is: 
The difference between 59 and 55 is: 