Reference :- Figures can be deceptive .

Reference:-   Gabbo's conundrum has me beat . Perhaps somebody can help .  

So this is the riddle . 

Three Tories try to book the night at a hotel room during a gas led economic recovery conference .  Unfortunately the hotel is almost fully booked .   The manager tells them they only have one room with three beds available for 150 quid .   The three Tories decide to share the room , and each pay 50 quid for the night . 

Later the manager realizes that the room is one of the cheap ones , and he should have charged them 100 quid .  He calls the bellboy and tells him to take 50 quid back to the overcharged Tories .  He hands the bellboy five ten quid notes . 

While in the elevator the bellboy decides that trying to split five ten quid notes between three Tories will be awkward .  Being entrepreneurial  ( shifty ) , the bellboy decides to give  the Tories one ten quid note each and pocket the other two ten quid notes for himself .   How would they know ?  

 The three Tories  ( and the bellboy ) were happy with the deal . 

So in the end , each Tory has paid 40 quid for the night ( 50 less the refunded ten quid note  ) , which meant they paid 120 quid for the room  ( 3 times 40 ) .    And the bellboy pocketed two ten quid notes , which is 20 quid . This adds up to 140 quid . 

 So where is the missing ten quid note that makes up the original 150 quid ?  

 I am sure I could work it out eventually , but there are more pressing matters to attend to , and I don't want to waste my time on Gabbo's stupid brain teaser . 

 Your comrade , Ken