Is there a way in the payment section to select multiple tickets at a certain cost?

Is there a way in the payment section to select multiple tickets at a certain cost? Like 3 tickets x $10 = $30? or 4 tickets x $10 = $40? 

In other words, an adult signs up and wants to purchase more than one ticket.  Can this be set up?

This is possible by adding an option in your payment tool's products. Here's a guide that you can refer to: https://www.jotform.com/help/225-How-to-add-options-to-Payment-Forms. You can set the quantity option where it automatically calculates the prices.

If you have a special pricing, you can also do it there. Here's a specific guide about it: https://www.jotform.com/help/265-What-is-Special-Pricing 

Let us know if you need more information on this.