Expired

A monday morning puzzle

13
Found 4th Oct 2010
3 guys go to London for the weekend and book into a cheap hotel-the receptionist tells them the room will cost 30 pounds,so they each pay a tenner each and go to their room.

Ten minutes later,the receptionist realises she has overcharged them and that the actual room cost is £25,so she calls the porter,gives him five pound coins and tells him to take the refund up to the room and give them it.

On the way upstairs,the porter pockets 2 quid for himself and refunds the 3 men one pound each.

So this means they have each paid £9 for the room-3x9=27,plus the £2 the porter took=£29.

so where is the other pound?
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13 Comments
doesnt work that way

they ended up paying £27 for the room (£25 for the hotel & £2 for the porter)
basically, you went wrong here:-

So this means they have each paid £9 for the room-3x9=27,MINUS the £2 the porter took=£25.
There is no missing pound.
csiman

basically, you went wrong here:-So this means they have each paid £9 for … basically, you went wrong here:-So this means they have each paid £9 for the room-3x9=27,MINUS the £2 the porter took=£25.



err,no.because there was originally 30 quid so if its MINUS the 2 the porter took,then theres a fiver missing is there not? they originally forked over £30-if they get a one pound refund each they have paid £9 each for the room=27 PLUS the 2 the porter has in his pocket=29.
It's a paradox.........it all depends on how you do the maths to get the total amount.

.............but there is still no missing pound.
Syzable

It's a paradox.........it all depends on how you do the maths to get the … It's a paradox.........it all depends on how you do the maths to get the total amount..............but there is still no missing pound.



ok sy-you too clever-you are correct-its a simple linguistic trick whereby you mix a multiplication and an addition and create a paradox(Im not that clever btw-thats the explanation in the book)

so it is all about how you explain it-the receptionist has 25,the guys have 3,the porter has 2=30
I love these........there are quite a few of them around. Hurt your brain early on a monday morning though. lol
BODMAS.
Worst puzzle ever.
barky

err,no.because there was originally 30 quid so if its MINUS the 2 the … err,no.because there was originally 30 quid so if its MINUS the 2 the porter took,then theres a fiver missing is there not? they originally forked over £30-if they get a one pound refund each they have paid £9 each for the room=27 PLUS the 2 the porter has in his pocket=29.



It right Barky.

They pay £30.

Receptionist gives porter £5.

They each get £1 back.

They have therefore paid £27 between them for a £25 room.

This leaves £2 difference for the porter to pocket.
It's the "3 x £9 = £27" bit which makes it a riddle.

Yes, granted this is correct, but they have already received the £1 refund at this point.

So they have paid 3 lots of £9 to make £27, but have had £1 refund each.

£27 + £3 = £30 originally paid.
(3 x £9) + (3 x £1) = £30.
Love the way people argue about this puzzle as if there really is/ isn't a missing pound
Edited by: "greg_68" 4th Oct 2010
My brain hurts
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