Q: How much is 91 minus 78? A: 
Q: How much is 36 minus 11? A: 
Q: How much is 99 minus 78? A: 
Q: How much is 91 minus 70? A: 
Q: How much is 81 minus 78? A: 
Q: How much is 91 minus 28? A: 
Q: How much is 93 minus 70? A: 
Q: How much is 91 minus 78? A: 