Q: What is 40 minus 20? A: 
Q: What is 88 minus 66? A: 
Q: What is 42 minus 20? A: 
Q: What is 40 minus 20? A: 
Q: What is 90 minus 20? A: 
Q: What is 40 minus 30? A: 
Q: What is 40 minus 24? A: 
Q: What is 40 minus 20? A: 