Multiplying the number of students eating at the cafeteria by three means that 3 * 10 = <<3*10=30>>30 students bring lunch.
The total number of students that eat lunch is 10 + 30 = <<10+30=40>>40 students
Since the class has 60 students, those who don't eat lunch are 60-40 = <<60-40=20>>20 students.
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