A school principal is booking hotel rooms for a class of 30 students to stay at during an overnight field trip.  Each of the hotel's rooms has two queen size beds, which can fit two students each, and a pull-out couch, which can fit one student.  How many rooms does the principal need to book to fit all of the students in the class?
Each room can fit 2*2 + 1 = <<2*2+1=5>>5 students.
Thus, the principal needs to book 30/5 = <<30/5=6>>6 rooms to fit everyone.
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