Yesterday, Roman called me while I was at work. "The cafeteria says you owe them $5.20."
How? I gave you $10 yesterday. Two weeks ago I gave you $5. You only eat in the cafeteria on Wednesdays.
"I don't know, they said you have to pay it."
Okay, let me call them and figure it out.
I called the cafeteria guy. He assured me he knows Roman and he assured me that Roman isn't paying him. "I'm not sure what he's doing with the money, but he isn't giving it to me."
I got home and questioned Roman about it. Roman finally fessed up. "I used the $10 to buy marbles from Brian. I played for keeps and lost them all."
How many marbles did he give you for $10?
5?! 5 marbles? How many marbles did he give you the other day for $5?
Roman, that doesn't even make sense.
I'm not upset that Roman used the money to buy something he wanted, even though he got ripped off. I'm upset that he didn't use basic math skills to figure out that he should have gotten at least 14 marbles on his second purchase.