Q: How much is 66 minus 20? A: 
Q: How much is 77 minus 16? A: 
Q: How much is 67 minus 20? A: 
Q: How much is 66 minus 20? A: 
Q: How much is 36 minus 20? A: 
Q: How much is 66 minus 40? A: 
Q: How much is 75 minus 29? A: 
Q: How much is 66 minus 20? A: 