Can I Borrow?Math brain teasers require computations to solve.This is a teaser for people who know the US coins. My apologies to any out-of-country visitors.
You and a friend pass by a standard coin-operated vending machine and you decide to get a candy bar. The price is US$0.95, but after checking your pockets, you only have a dollar (US$1), and the machine only takes coins. You turn to your friend and have this conversation. You: Hey, do you have change for a dollar? Friend: Let's see... I have 6 US coins but, although they add up to US$1.15, I can't break a dollar. You: Huh? Can you make change for half a dollar? Friend: No. You: How about a quarter? Friend: Nope. And before you ask I can't make change for a dime or nickel either. You: Really? And these 6 coins are all US government coins currently in production? Friend: Yes. You: Well, can you just put your coins into the vending machine and buy me the candy bar, and I'll pay you back? Friend: Sorry, I'd like to, but I can't with the coins I have. What coins does your friend have? 
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