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Mathematics 7 Online
OpenStudy (anonymous):

Mrs. Park is organizing a class trip to the aquarium, and has raised $900 to help pay for it. Adult tickets are $45, and student tickets are $30. If she has 25 students and needs to take one adult for every five students, how much will each student have to pay so that the adults who agree to chaperone will have to pay nothing?

OpenStudy (golikrishna):

{(25/5)*45 +(25*30)}/25 =39

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