Q: How much is 80 minus 50? A: 
Q: How much is 21 minus 20? A: 
Q: How much is 84 minus 50? A: 
Q: How much is 80 minus 50? A: 
Q: How much is 60 minus 50? A: 
Q: How much is 80 minus 10? A: 
Q: How much is 80 minus 51? A: 
Q: How much is 80 minus 50? A: 