Here's why:
* The numbers vary in different adaptations: The book, the original movie, and the remake all have different depictions of the number of Oompa Loompas.
* They're constantly working: We see them throughout the factory, so they likely represent a whole workforce, not just a specific number.
* It's not a key plot point: The focus is on the story and the characters, not a precise count of the Oompa Loompas.
While there's no definitive answer, you can enjoy the whimsical portrayal of the Oompa Loompas without worrying about an exact count!