At the ticket office

Ticket clerk.- Hello.
Marina.- Hi, i'd like three tickets, please.
Ticket clerk.- Certainley. How old are you?
Marina.- I'm fourteen, my sister ten and my
brother eighteen.
Ticket clerk.- All right. So, that's one adult and
two child. That's 12.50 pounds altogether, please.
Marina.- OK. Here you are.
Ticket clerk.- Thanks. Here's your change and your
tickets. Enjoy your visit.