Q: What is 20 minus 18? A: 
Q: What is 82 minus 77? A: 
Q: What is 29 minus 18? A: 
Q: What is 20 minus 10? A: 
Q: What is 70 minus 18? A: 
Q: What is 20 minus 18? A: 
Q: What is 22 minus 10? A: 
Q: What is 20 minus 18? A: 