Q: How much is 99 minus 69? A: 
Q: How much is 31 minus 16? A: 
Q: How much is 99 minus 69? A: 
Q: How much is 99 minus 60? A: 
Q: How much is 79 minus 69? A: 
Q: How much is 99 minus 79? A: 
Q: How much is 91 minus 66? A: 
Q: How much is 99 minus 69? A: 