The difference between 99 and 70 is: 
The difference between 94 and 31 is: 
The difference between 97 and 70 is: 
The difference between 99 and 70 is: 
The difference between 99 and 70 is: 
The difference between 99 and 30 is: 
The difference between 103 and 74 is: 
The difference between 99 and 70 is: 