user: Ms. Cole teaches math in three levels of classes in her school. There are four times as many students in Ms. Cole's fourth-level math class as in her sixth-level math class. The number of students in her seventh-level math class is twice that in the fourth-level math class.  If Ms. Cole's sixth-level class has 40 students, how many math students does Ms. Cole teach? Let's think step by step and output the final answer after "####".
Answer: 520