The difference between 40 and 20 is: 
The difference between 43 and 36 is: 
The difference between 49 and 20 is: 
The difference between 40 and 20 is: 
The difference between 40 and 20 is: 
The difference between 40 and 10 is: 
The difference between 45 and 26 is: 
The difference between 40 and 20 is: 