"To get paid, obviously."

Snorting in amusement, she laughed at Ed and then reached over, writing a few maths questions that were ridiculous and took a bit of thought, wanting to see how good he was. She was good at maths but she probably wasn't on his level but hey, it was fun to play. She pulled out a purple pen and handed it to him. "Solve. I'll write."

They had little else to do so why not?