Question: Can you walk me through the solution of: James has 30 teeth. His dentist drills 4 of them and caps 7 more teeth than he drills. What percentage of James' teeth does the dentist fix?
Answer: 
First find the total number of teeth the dentist caps: 4 teeth + 7 teeth = 11 teeth
Then find the total number of teeth the dentist fixes: 11 teeth + 4 teeth = 15 teeth
Then divide that number by the total number of teeth and multiply by 100% to find the percentage of teeth he fixes: 15 teeth / 30 teeth * 100% = 50%