How many questions do you have to miss on a 90 question test to get a 80?

Well, let's think about this like painting a happy little tree. If you have a 90-question test and you want to get an 80, you would need to get 72 questions correct. So, if you missed 18 questions, you would still achieve your goal of getting that 80. Remember, it's all about focusing on the positive and not getting too caught up in the small mistakes along the way.