Q: What is 77 minus 15? A: 
Q: What is 78 minus 39? A: 
Q: What is 78 minus 15? A: 
Q: What is 77 minus 14? A: 
Q: What is 47 minus 15? A: 
Q: What is 77 minus 45? A: 
Q: What is 81 minus 19? A: 
Q: What is 77 minus 15? A: 