Riddle
01-09-2008, 03:15 PM
#1
Riddle
3 lads walk into a hotel, and the receptionist charges them £30 for a room (3 sharing).
Later the receptionist realises a mistake, the room should only be £25 so he gives the porter a fiver and tells him to go and give the lads in the room the five pounds.
Porter thinks about it and thinks he you cant share five pounds between 3 of them so keeps two pounds for himself and gives 3 pounds back to the lads in the room.
But heres the tricky bit:
They paid ten pounds at first but are given a pound back so effectively they pay 9 pounds each.
9+9+9=27
Add in the 2 for the porter....
27+2=29
Wheres the other pound gone????
Later the receptionist realises a mistake, the room should only be £25 so he gives the porter a fiver and tells him to go and give the lads in the room the five pounds.
Porter thinks about it and thinks he you cant share five pounds between 3 of them so keeps two pounds for himself and gives 3 pounds back to the lads in the room.
But heres the tricky bit:
They paid ten pounds at first but are given a pound back so effectively they pay 9 pounds each.
9+9+9=27
Add in the 2 for the porter....
27+2=29
Wheres the other pound gone????
Do NOT reply with the solution please, just reply saying if its obvious to you or not what the solution is, as im interested to see if most people find it obvious or not?
01-09-2008, 03:24 PM
#7
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had this the other day off one of the girls at work.
she'd been stewing on it all night and knew it was wrong but couldn't figure out why.
as i'm clearly a mathematical genius i explained it to her in about 2 minutes.
she'd been stewing on it all night and knew it was wrong but couldn't figure out why.
as i'm clearly a mathematical genius i explained it to her in about 2 minutes.
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01-09-2008, 03:25 PM
#8
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what a cunt i'v been
01-09-2008, 03:27 PM
#11
I dont believe you need any more than the maths skills we normally have by about aged 10, its a different thing its testing, its testing wether or not you accept things said to you without testing them for yourself IMHO, its NOT a maths problem as such.
Last edited by Chip; 01-09-2008 at 03:29 PM.
01-09-2008, 03:29 PM
#14
i think i've got this book somewhere
http://puzzlemuseum.com/library/hoffm/hoff-bk.htm
which has it in it
http://puzzlemuseum.com/library/hoffm/hoff-bk.htm
which has it in it
01-09-2008, 03:35 PM
#18
I've found that life I needed.. It's HERE!!
someone told me one about a guy buying a torch and a battery and a pound going missing. I'm no good at maths.
They're logical if explained to you properly. i still dont get them though.
They're logical if explained to you properly. i still dont get them though.
02-09-2008, 10:17 AM
#21
The answer, is that the question is invalid mate.
Its not a test of maths, its a test of wether you beleive what you are told without questioning it.
30 quid ended up as follows:
3 refunded to the lads
2 kept by the porter
25 paid for the room
So the 9 pounds each they paid to be 27, was 25 for the room and 2 for the porter.
The porters amount wasnt added to the 27 to make 29, it was subtracted from the 27 to make the 25 the room cost.
So the riddle, is simply spotting that the riddle is wrong.
Its not a test of maths, its a test of wether you beleive what you are told without questioning it.
30 quid ended up as follows:
3 refunded to the lads
2 kept by the porter
25 paid for the room
So the 9 pounds each they paid to be 27, was 25 for the room and 2 for the porter.
The porters amount wasnt added to the 27 to make 29, it was subtracted from the 27 to make the 25 the room cost.
So the riddle, is simply spotting that the riddle is wrong.
02-09-2008, 10:26 AM
#24
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bang on mate. it's more to do with the way you think imo.
i'm still a mathematical genius though
02-09-2008, 10:30 AM
#26
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Feel free to fabricate an answer, I made it up
02-09-2008, 12:15 PM
#30
Rickbartlett, not only did you fail to work it out, you failed to read it too
The answer, is that the question is invalid mate.
Its not a test of maths, its a test of wether you beleive what you are told without questioning it.
30 quid ended up as follows:
3 refunded to the lads
2 kept by the porter
25 paid for the room
So the 9 pounds each they paid to be 27, was 25 for the room and 2 for the porter.
The porters amount wasnt added to the 27 to make 29, it was subtracted from the 27 to make the 25 the room cost.
So the riddle, is simply spotting that the riddle is wrong.
Its not a test of maths, its a test of wether you beleive what you are told without questioning it.
30 quid ended up as follows:
3 refunded to the lads
2 kept by the porter
25 paid for the room
So the 9 pounds each they paid to be 27, was 25 for the room and 2 for the porter.
The porters amount wasnt added to the 27 to make 29, it was subtracted from the 27 to make the 25 the room cost.
So the riddle, is simply spotting that the riddle is wrong.
02-09-2008, 02:51 PM
#32
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Maybe an easy way of showing it is:
100 - 10% = 90
Then add that 10% back:
90 + 10% = 99
Bit like working out transmission losses only works one way.
Guess it is either glaringly obvious, or baffling as fuck, depends on how your brain works.
100 - 10% = 90
Then add that 10% back:
90 + 10% = 99
Bit like working out transmission losses only works one way.
Guess it is either glaringly obvious, or baffling as fuck, depends on how your brain works.
03-09-2008, 08:44 PM
#33
Advanced PassionFord User
3 lads walk into a hotel, and the receptionist charges them £30 for a room (3 sharing).
Later the receptionist realises a mistake, the room should only be £25 so he gives the porter a fiver and tells him to go and give the lads in the room the five pounds.
Porter thinks about it and thinks he you cant share five pounds between 3 of them so keeps two pounds for himself and gives 3 pounds back to the lads in the room.
But heres the tricky bit:
They paid ten pounds at first but are given a pound back so effectively they pay 9 pounds each.
9+9+9=27
Add in the 2 for the porter....
27+2=29
Wheres the other pound gone????
so what your saying is that there is £30 the porter takes £2 which leaves £28 how does that now work out each lad has paid £9 another £1 has appeared out of thin air
Later the receptionist realises a mistake, the room should only be £25 so he gives the porter a fiver and tells him to go and give the lads in the room the five pounds.
Porter thinks about it and thinks he you cant share five pounds between 3 of them so keeps two pounds for himself and gives 3 pounds back to the lads in the room.
But heres the tricky bit:
They paid ten pounds at first but are given a pound back so effectively they pay 9 pounds each.
9+9+9=27
Add in the 2 for the porter....
27+2=29
Wheres the other pound gone????
so what your saying is that there is £30 the porter takes £2 which leaves £28 how does that now work out each lad has paid £9 another £1 has appeared out of thin air
03-09-2008, 09:14 PM
#34
PassionFord Post Troll
3 lads walk into a hotel, and the receptionist charges them £30 for a room (3 sharing).
Later the receptionist realises a mistake, the room should only be £25 so he gives the porter a fiver and tells him to go and give the lads in the room the five pounds.
Porter thinks about it and thinks he you cant share five pounds between 3 of them so keeps two pounds for himself and gives 3 pounds back to the lads in the room.
But heres the tricky bit:
They paid ten pounds at first but are given a pound back so effectively they pay 9 pounds each.
9+9+9=27
Add in the 2 for the porter....
27+2=29
Wheres the other pound gone????
so what your saying is that there is £30 the porter takes £2 which leaves £28 how does that now work out each lad has paid £9 another £1 has appeared out of thin air
Later the receptionist realises a mistake, the room should only be £25 so he gives the porter a fiver and tells him to go and give the lads in the room the five pounds.
Porter thinks about it and thinks he you cant share five pounds between 3 of them so keeps two pounds for himself and gives 3 pounds back to the lads in the room.
But heres the tricky bit:
They paid ten pounds at first but are given a pound back so effectively they pay 9 pounds each.
9+9+9=27
Add in the 2 for the porter....
27+2=29
Wheres the other pound gone????
so what your saying is that there is £30 the porter takes £2 which leaves £28 how does that now work out each lad has paid £9 another £1 has appeared out of thin air
£30 total devided thus:
£25 for the room
£2 for the porter
£3 refund to the lads.
Move on.lol
04-09-2008, 07:41 AM
#37
STOP!... Carry on
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