Mr. Luthi is taking his 30 passing students on a field trip to the aquatic center. They will all get a ticket to
enter and swim as well as a serving of pizza and ice cream that costs $3 per student. Ms. Byer's is taking her
12 passing students on a field trip to the museum. Their tickets cost twice as much and they all get a
souvenir t-shirt for $10. Ms. Byers and Mr. Luthi paid the same amount for their field trips. How much did
tickets to each field trip cost?