Q: How much is 72 minus 67? A: 
Q: How much is 52 minus 28? A: 
Q: How much is 79 minus 67? A: 
Q: How much is 72 minus 60? A: 
Q: How much is 92 minus 67? A: 
Q: How much is 72 minus 47? A: 
Q: How much is 79 minus 64? A: 
Q: How much is 72 minus 67? A: 