Tom, Dick, and Harry each paid 10 dollars for a room at the hotel. When the manager found out, he told the desk clerk that Tom, Dick, and Harry were friends of his and they should be charged only $25.
The desk clerk gave the bell boy $5 and told him to return it to Tom, Dick and Harry. The bell boy, however, decided to give them only three dollars and keep two for himself.
If Tom, Dick and Harry each received $1 back, then that means they only paid $27 for the room. With the $2 the bell boy has in his pocket, the total is $29.
What happened to the missing dollar?
Augmental 
They paid 25$ for the room, received 3$ and the bell boy got 2$
so 25$+3$+2$=30$ i don’t see a missing dollar:)
They paid 27, and the bell boy took 2, leaving the hotel with 25.
The ‘missing dollar’ in the deliberately misleading 27+2 example is the dollar that was given back by the third of Tom, Dick, and Harry.
its not 27+2+29, but 27-2=25
so they just trick us by the way they write it