Q: How much is 91 minus 30? A: 
Q: How much is 97 minus 11? A: 
Q: How much is 99 minus 30? A: 
Q: How much is 91 minus 30? A: 
Q: How much is 81 minus 30? A: 
Q: How much is 91 minus 40? A: 
Q: How much is 100 minus 39? A: 
Q: How much is 91 minus 30? A: 