Here is my question
- In a class that has $40$ students, there are $10$ students who could not pass the math exam and $30$ students who passed the english exam. If there are $6$ students who could not pass the both exam, How many are there students who passed the both exam?
I'm currently not able to build the correct equation. Might I get help? It seems like a bit confused. That's why I need get help.