Solving a word problem...

Me: So the refund amount varies directly to the number of cans you recycle.
Student: What do you mean?
Me: You know, like when you turn in a can, you get a few cents back. I don't know if they do it in Virginia. I know in California they did.
Student 2: You're from California?
Me: Yeah, but back to math...
Student 2: I KNEW you looked like a Cali girl.
Student 3: Nuh-uh, she's way too pale.