Final answer:
To find the maximum cost of each ticket, divide the highest total amount spent for the tickets by the number of tickets.
Step-by-step explanation:
To find the maximum cost of each ticket, we need to divide the highest total amount spent for the tickets by the number of tickets. In this case, the highest total spent is $81. To get the maximum cost per ticket, we divide $81 by the number of tickets, which we don't know at this point.
Let's assume there are 'n' tickets. So, the maximum cost per ticket will be $81/n. Since each group spends a different total amount, the number of tickets for each group will be different.