Pretend you are driving a bus.
12 people get on, then 7 people get off.
27 people get on, then 15 people get off.
9 people get on, then 17 get off.
How old is the bus driver?
27 people get on, then 15 people get off.
9 people get on, then 17 get off.
How old is the bus driver?
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