The cost is $30- (this happened a long time ago) so ea. man paid $10- ... The hotel employee that accepted the money suddenly realizes that the men were overcharged because the actual cost of the room was $25- ... so they give the bellboy 5 one dollar bills to return to the men. On the way to the room, the bellboy thinks to himself, these men don't know how much refund they have coming, so he keeps $2- ... He then gives the men $3- refund or $1- refund to ea. man ... w/ the $1- ea man got back, they have now paid $9- ea. ... 3 men x $9- ea. = $27- ... the bellboy kept $2- ... $27- + $2- = $29- ... the original amt. paid was $30- ... Where's the missing dollar?