Q: How much is 30 minus 20? A: 
Q: How much is 68 minus 56? A: 
Q: How much is 36 minus 20? A: 
Q: How much is 30 minus 20? A: 
Q: How much is 90 minus 20? A: 
Q: How much is 30 minus 20? A: 
Q: How much is 34 minus 27? A: 
Q: How much is 30 minus 20? A: 