Q: What is the result of 28 minus 28? A: 
Q: What is the result of 81 minus 47? A: 
Q: What is the result of 29 minus 28? A: 
Q: What is the result of 28 minus 20? A: 
Q: What is the result of 38 minus 28? A: 
Q: What is the result of 28 minus 18? A: 
Q: What is the result of 20 minus 23? A: 
Q: What is the result of 28 minus 28? A: 