Students travel and rent a boat. If there are ten people in one boat, there will be two more seats. If there are two people in one boat, there will be one less boat. How many boats do you want to rent?

Answer: 4
If you want to charter x, you need to charter X-1 now
10X - 2 = 12（X - 1） >> X = 5
Now we need to charter four

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