Q: How much is 54 minus 21? A: 
Q: How much is 58 minus 56? A: 
Q: How much is 59 minus 21? A: 
Q: How much is 54 minus 20? A: 
Q: How much is 34 minus 21? A: 
Q: How much is 54 minus 41? A: 
Q: How much is 61 minus 28? A: 
Q: How much is 54 minus 21? A: 