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Can you solve this riddle/maths question?



Muhammad - I’m hard - Bruce Lee

You can't change fighters
NSC Patron
Jul 25, 2005
10,911
on a pig farm
you didnt take the trolley back, thats where ya quid is
 




MJsGhost

Oooh Matron, I'm an
NSC Patron
Jun 26, 2009
5,026
East
You are in a shop, and you see a snazzy pair of jeans for £97.

You have no money on you though, so you borrow £50 from person 1 and £50 from person 2.

You are left with £3, so you give £1 to person 1, and £1 to person 2 and you keep £1.

So you owe your two friends in total 49 x 2 = £98

You have £1 so that's £99.

So where has the other pound gone...?

You have £1 in hand + jeans 'worth' £97 = the £98 that you owe. (with the £1 each given back to person 1 & 2 making it up to the total of £100)

The riddle looks like the logical way to tot it all back up, but it actually isn't. It's cleverly done, but the £1 you have in hand should be taken off the £99 (to make the value of the jeans) rather than added to it to attempt to total £100.

I haven't explained that very well, have I?!?
 


MJsGhost

Oooh Matron, I'm an
NSC Patron
Jun 26, 2009
5,026
East
Mathematically speaking, you're just adding the pound on the wrong side of the equation.

To take it a step further:
You pay them back their £49 each then that's -£98 for you
But you still have the £1
So you've paid £97 for the jeans.
Which is right.

Correct! :)
 


Cosmic Joker

The Motorik
Apr 14, 2010
570
Chichester
The £1 should not be added to the £98 as it is part of the £98 pound debt.

You initially borrow £100 but repay £2 straight away leaving a debt of £98. Of which, £1 you have in your hand and the other £97 which you have foolishly spent on ludicrously overpriced jeans instead of a nice winter coat, you have to get from home or out of your bank account to be able to settle.

Edit: I hadn't seen Robdinhino's post or the ones following when I wrote the above. He has correctly made the same point about the £1 should only be taken away, not added
 
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Goldstone Rapper

Rediffusion PlayerofYear
Jan 19, 2009
14,865
BN3 7DE
This is a modern version of the famous 'where did the missing dollar go?' riddle involving gentlemen sharing a hotel room. Oo-er!
 




JamesAndTheGiantHead

Well-known member
Sep 2, 2011
6,349
Worthing
Viz's version :lol:

390429_10150943014375333_746420332_21701808_68081235_n.jpg
 








super-seagulls

Soup! Why didn’t I get any Soup?
Feb 1, 2011
3,127
Probably working!
It's like the old playground riddle.
Look I have 11 fingers, (counting down the fingers on one hand) 11,10,9,8,7,6. And 5 on the other hand makes 11!!
Maths doesn't work like this.
 








Herr Tubthumper

Well-known member
NSC Patron
Jul 11, 2003
62,706
The Fatherland
It's like the old playground riddle.
Look I have 11 fingers, (counting down the fingers on one hand) 11,10,9,8,7,6. And 5 on the other hand makes 11!!
Maths doesn't work like this.

How do you count 6 (11 to 6) on the first hand though? If I wanted to perform this riddle how do I do the first part?

I think I know where you're coming from and there are lots of examples of this, it was nick-named lamp-post theory in my day.. the difference between gaps and digits.
 




Tony Meolas Loan Spell

Slut Faced Whores
Jul 15, 2004
18,071
Vamanos Pest
Anyone considering spending £97 on a pair of jeans deserves to be fleeced.

I know someone who would spend considerably more. And wouldnt need to borrow the money either. So thats my answer.
 


Tony Meolas Loan Spell

Slut Faced Whores
Jul 15, 2004
18,071
Vamanos Pest
How about this for a maths riddle...

I spend £30 on a book Travel Vouchers prior to the Doncaster Game.

I attend all home games and do not have my voucher collected/checked once.

Friends attend all games but they did not buy vouchers so spend £0

Where has my £30 gone?

This!!!
 


super-seagulls

Soup! Why didn’t I get any Soup?
Feb 1, 2011
3,127
Probably working!
How do you count 6 (11 to 6) on the first hand though? If I wanted to perform this riddle how do I do the first part?

I think I know where you're coming from and there are lots of examples of this, it was nick-named lamp-post theory in my day.. the difference between gaps and digits.
Yeah quite right you start at ten. It was a long time ago!
 


Fungus

Well-known member
NSC Patron
May 21, 2004
7,156
Truro
Yeah quite right you start at ten. It was a long time ago!

So it should go something like this...

It's like the old playground riddle.
Look I have 10 fingers, (counting down the fingers on one hand) 10,9,8,7,6. And 5 on the other hand makes 10!!
Maths doesn't work like this.

I don't remember that old playground riddle.
 




chimneys

Well-known member
Jun 11, 2007
3,609
I'm no Einstein, but that really was a simple question/answer Andrew!

Let me guess, those amazing teachers these days have helped you gain an A* at GCSE Maths, the same at A level, and you are now studying Nuclear Science at a top university?!

The youth of today eh!
 


zfleas

Active member
Aug 8, 2011
382
Worthing
Your in a room with two birds. One bird always lies and one bird always tells the truth, but you do not know which bird is which. There are two doors. One door leads to certain death and another to St Marys on saturday. You can only ask one question to one bird. How do you get to St marys?
 


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