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Three friends check into a motel for the night and the clerk tells them the bill is $30, payable in advance. So, they each pay the clerk $10 and go to their room. A few minutes later, the clerk realizes he has made an error and overcharged the trio by $5. He asks the bellhop to return $5 to the 3 friends who had just checked in. The bellhop sees this as an opportunity to make $2 as he reasons that the three friends would have a tough time dividing $5 evenly among them; so he decides to tell them that the clerk made a mistake of only $3, giving a dollar back to each of the friends. He pockets the leftover $2 and goes home for the day! Now, each of the three friends gets a dollar back, thus they each paid $9 for the room which is a total of $27 for the night. We know the bellhop pocketed $2 and adding that to the $27, you get $29, not $30 which was originally spent. Where did the other dollar go????
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Tragically sorry...
Missing dollar
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in this question there is a trick in words.if the three friends have paid 9$ each, it makes 27$ in total.25$ is given to the clerk and the bellhopp pockets 2$.it makes 29$ in total which is the amount given by the three friends.

and in your question if you give the friends 1$ each the amount given becomes 27 not 30$. 25$ for the room 2$ pocketed by the bellhop.(Shame on the bellhop)
clerk says 30. Corrects his mistake and says 25. Bellhop is to return the money but only gives back two. the three friends have one donnar each.

mistake

30-25=5

bellhop

25+2=27

Three friends

1+1+1+27=30

So the last doller was with one of the friends.

Am I right?
there is no doller left

I am sure about it

so I am right
Students: We have free audio pronunciation exercises.
There had been a discussion on this topic earlier. As Anne had said please refer to her referred link. It has the solution to this puzzle!!!