The difference between 29 and 20 is: 
The difference between 42 and 15 is: 
The difference between 28 and 20 is: 
The difference between 29 and 25 is: 
The difference between 39 and 20 is: 
The difference between 29 and 10 is: 
The difference between 37 and 28 is: 
The difference between 29 and 20 is: 