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You're driving a bus. There are 15 people on it. Stop number 1, 2 people get on and 3 get off. Stop 2, 3 people get on 2 people get off. Stop number 3, 1 person gets on, 2 people get off. Stop number 4, 7 people get on, 10 people get off.
How old is the bus driver?
Hmm, I'd say, Rethoric Question, no need to answer when there's no actual answer but the driver itself. But I digress.
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