The solution to the conundrum I proposed in the previous post is in the wording, isn’t it? There really is no missing dollar. The hotel got $25 for the room ($30 minus the $5 given to the bellhop). The three sisters paid a total of $27 ($9 x 3) for the room. The difference of $27-$25 = $2 is what the bellhop kept for himself. Everything accounted for.
Dear ol’ Dad
Vaya con Dios mis hijas