How to Write an Essay That Is Three Pages Long

I've become notorious in ninth grade for being able to just cross stuff out. I can take what was a 20 word sentence and turn it to five. They don't really know where the sentence is going, plus they need to fill a few pages. So do you think we do ourselves a disservice by saying this needs to be three pages long? That is why I never say it. It's like, yeah, you are putting something out there that is going to be questioned. And it's a lot easier to hide it.