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The Solution: There is no missing dollar.The addition is worded to confuse you. Once the friends had the $3 back form the owner, the totla ammount they spent was $27 not $30. So, the rest of the problem should only use the number $27. The $2 kept by the owner brings the total down to $25, which was the cost of the room.
* i dont have the pound key, so i ised dollar signs.
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