Winning dollars

Two people were flipping (拋) coins. Each time, they bet (打賭) US $1 each game. At the end, one person won US $3. The other won three times. How many games did they play?

答案：
解析：

The person who won three games must have also lost six games, since his opponent (對手) won US $3. So in total, they played nine games.


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