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Each man ends up having paid ($10 - $1 =) $9, which amounts to (3 * $9 =) $27
$25 of that goes toward the room.
$2 (the rest) of that is taken by the clerk.
Of the $30 originally given, $25 goes toward the room, $2 is taken by the clerk, and $3 is given to the men. Which amounts to $30.
The riddle mixes the two separate calculations together.
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