It is misleading because of the last line. They should not be trying to reach 30$. If each guy gets 3 bucks back, they each paid 9, for a total of 27. 2 dollars of the 27 were paid to the bellboy, so you don't add 2 to the number of 27, you subtract to reach 25. Once the three guys are given a dollar back, the max number you can attain is 27. Not 30.
Or so I believe...I am bad with these things.
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