human
A class has 60 students. The number of students who bring their lunch is thrice the number of those who eat in the school cafeteria. The rest of the students don't eat lunch. If 10 students eat in the school cafeteria, how many don't eat lunch?
assistant
How many students bring lunch? ** Multiplying the number of students eating at the cafeteria by three means that 3 * 10 = <<3*10=30>>30 students bring lunch.
How many students eat lunch? ** The total number of students that eat lunch is 10 + 30 = <<10+30=40>>40 students
How many students don ** Since the class has 60 students, those who don't eat lunch are 60-40 = <<60-40=20>>20 students.
#### 20