have you ever passed a math class??

So the diner at work has a new host who is still in high school, and apparently hasn't been trained very well. Tuesday night, he comes up to the cage with a dollar bill and asks how much is in a roll of pennies. I tell him 50 cents, and he says he needs two rolls. About an hour later, he comes back up with a 10 dollar bill, wanting to know how much is in a roll of quarters. 10 dollars, I tell him, and I also tell him how much is in each roll, and to remember that for next time. He kinda gives me a "whatever" look, and walks away. A couple hours later he is back. He slaps a 100 dollar bill on the counter and asks how many 20s are in that. I tell him four, to see if he will catch that I am lying to him. Nope, he sure doesn't. He says that he needs some 20s, in that case.

So I grab five 20s out of the drawer, but when I count them out to him, instead of saying "20, 40, 60, 80..." I just say, "One, two, three, four," and keep the fifth one hidden from sight. "Thanks!" he says, swiping the bills off the counter, and walking off. Three steps away, you can see him counting the money. "No! That's not right!" he shouts at me, coming back to get the rest of his money.

I don't know if that's someone I would trust at my cash register...