Four mathematician friends were hanging out at a diner one night. After several hours, the waitress dropped off the check. The four friends spent a few seconds figuring out who owed what and how to divide up the total, and handed credit cards to the waitress when she came by, along with notes instructing her how much to put on each card.
At the register, the first card she came to included this note: 100204180.
Smiling, she simply placed that card on the counter and charged the entire bill to the other three cards.
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Four mathematician friends were hanging out at a diner one night. After several hours, the waitress dropped off the check. The four friends spent a few seconds figuring out who owed what and how to divide up the total, and handed credit cards to the waitress when she came by, along with notes instructing her how much to put on each card.
At the register, the first card she came to included this note: 100204180.
Smiling, she simply placed that card on the counter and charged the entire bill to the other three cards.
What did the waitress figure out from the note?
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