Q: What is 51 minus 20? A: 
Q: What is 73 minus 63? A: 
Q: What is 57 minus 20? A: 
Q: What is 51 minus 20? A: 
Q: What is 61 minus 20? A: 
Q: What is 51 minus 40? A: 
Q: What is 60 minus 29? A: 
Q: What is 51 minus 20? A: 