The trick to this riddle is not to add the 2 dollars, but to subtract them.
9*3=27(total amount paid by the guests)
27+1+1+1=30(they each got one in their pockets)
27-2=25(2 dollalrs is how much bellhop took, 25 is total price paid for the room, which means that 25+2=27 which is the total amount paid by the guests)
The bold is the solution.
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