Q: What is 51 minus 39? A: 
Q: What is 54 minus 46? A: 
Q: What is 59 minus 39? A: 
Q: What is 51 minus 30? A: 
Q: What is 71 minus 39? A: 
Q: What is 51 minus 49? A: 
Q: What is 52 minus 30? A: 
Q: What is 51 minus 39? A: 