) The ticket prices for a concert are shown in the following table. Price (in Australian dollars, S) Ticket Type Adult 15 Child 10 Student 12 A total of 600 tickets were sold. • The total amount of money from ticket sales was $7816. • There were twice as many adult tickets sold as child tickets. Let the number of adult tickets sold be x, the number of child tickets sold be y, and the number of student tickets sold be z. a) Write down three equations that express the information given above. b) Find the number of each type of ticket sold.

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