Q: What is 72 minus 68? A: 
Q: What is 40 minus 31? A: 
Q: What is 79 minus 68? A: 
Q: What is 72 minus 60? A: 
Q: What is 72 minus 68? A: 
Q: What is 72 minus 68? A: 
Q: What is 74 minus 60? A: 
Q: What is 72 minus 68? A: 