Q: How much is 90 minus 13? A: 
Q: How much is 94 minus 81? A: 
Q: How much is 95 minus 13? A: 
Q: How much is 90 minus 10? A: 
Q: How much is 80 minus 13? A: 
Q: How much is 90 minus 53? A: 
Q: How much is 98 minus 11? A: 
Q: How much is 90 minus 13? A: 