Look what Warseer's "discovered"...

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**Centurian99**

Mad Doc Grotsnik wrote:Confusing Maths time!

3 people each chip in £10 for a £30 model.

After the purchase, the shop owner remembers that model had £5 of it's price, and so gives them £5 change in £1 coins.

To thank him for his honest, they give him £2, and each keep £1 each.

This reduces each persons spend to £9 each. 3x9=27....

£2 went to shop owner.....making the total spent £29....

WHERE IS THE OTHER POUND?

Please tell me you're joking.

**Kid_Kyoto**

Centurian99 wrote:
Mad Doc Grotsnik wrote:Confusing Maths time!

3 people each chip in £10 for a £30 model.

After the purchase, the shop owner remembers that model had £5 of it's price, and so gives them £5 change in £1 coins.

To thank him for his honest, they give him £2, and each keep £1 each.

This reduces each persons spend to £9 each. 3x9=27....

£2 went to shop owner.....making the total spent £29....

WHERE IS THE OTHER POUND?

Please tell me you're joking.

OK maybe it's cause it's 1 am but I'm lost.

On the reliability of math (or maths if you must)
http://xkcd.com/435/

XKCD is awesome.

**Orkeosaurus**

I think I got it, not sure though:

There isn't another pound, in fact, there's only 27 pounds exchanged. You counted the 2 pounds twice; once at the end, but you never subtracted it from the total pounds spent at the beginning. If you had, you'd have had (28/3 -1) per person, for 8.333 per person and 25 spent total, plus the 2 for a total of 27.

Person 1 ..... Person 2 ..... Person 3 ..... Shop Owner ..... Total
..-10...............-10...............-10.................+30.................0..

The purchase is made.

Person 1 ..... Person 2 ..... Person 3 ..... Shop Owner ..... Total
..-10..............-10................-10.................+25...............-5.

The shop owner has 5 pounds left.

Person 1 ..... Person 2 ..... Person 3 ..... Shop Owner ..... Total
...-9................-9.................-9..................+25................-2.

The shop owner gives 1 to each person, has 2 left over.

Person 1 ..... Person 2 ..... Person 3 ..... Shop Owner ..... Total
...-9................-9.................-9..................+27.................0..

The shop owner is given the other 2 for himself.

-9 + -9 + -9 = -27, so it balances out the 27 received by the shop owner.

**Mad Doc Grotsnik**

Indeed.

It's essentially an incorrectly written formula.

But it's a good brainteaser nonetheless.

**Orkeosaurus**

I'll say.

**Grot 6**

Orkeosaurus wrote:
jhrovii wrote:Parts of this thread are why I don't frequent dakka often: while there is a higher caliber of poster to be found here, there is also a nerd arrogance that is just overwhelming. Instead of having a healthy thread of mockery, there is an infestation of several loud, frustrated students willing to indirectly flame "the ignorants". People that must still hold resentments from their childhood, being compelled to lord their "intelligence" and "education" over everyone else.

I am very serious when I say, "shush". Dakka could be so much better without it. I say this so that maybe people will listen and I can enjoy the forum without suffering the whining of children.

Get over yourself.

Uhh....

QFT

**Grot 6**

AND.... Red ones go fasta!!!!

**Orkeosaurus**

Okay, here's an oldy but a goody.

The Emperor comes down from the golden throne and says "You! Warhams player! I'm going to give the chance of a lifetime!"

You say "Awesome!"

The Emperor says "Here we have three rhinos. Two of these rhinos are filled with snotlings, but the one is filled with 50,000 Imperial Credits! You can buy several Land Raiders, some terminator armor; whatever you want!"

"Wow!" You say. "What a deal!"

"Alright then." The Emperor points at the rhinos. "Pick one."

You look at the three rhinos, hoping to see some sign of which one is filled with snotlings, but they all look identical. You shrug, and pick the one on your left.

"Alright!" The Emperor looks at the other two rhinos. "Inny Minny Miny Moe. Catch a Tyrant by the toe..." The Emperor randomly lands on the rhino to your right.

"Now, let's see what's in here... Ah!" The Emperor opens up the rhino and a bunch of gibbering snotlings pour out. "Well, looks like that was one of the snotling ones."

"Now, citizen, I will give you a choice. If you want, you can switch the rhino you've chosen, and pick the one in the middle. However, if you do this, and the middle rhino is the rhino with the credits, 500 credits will be subtracted from the total. Think carefully."

Now, do you choose the the rhino in the middle, or stick with the one on the left?

**Ensis Ferrae**

Orkeosaurus wrote:Why does it matter how much the model weighs?

in this case, he is talking about money.... that funny little symbol which i cant make on my computer right now, is the Pound symbol, ya know, as in the monetary unit of the UK

**Orkeosaurus**

I know, I was just joking.

**Ensis Ferrae**

ahh ok.... ill just go back up my tree, to my horde of nuts

**Orkeosaurus**

No don't leave!

Post byzantine math questions!

**BrockSamson**

Mad Doc Grotsnik wrote:Confusing Maths time!

3 people each chip in £10 for a £30 model.

After the purchase, the shop owner remembers that model had £5 of it's price, and so gives them £5 change in £1 coins.

To thank him for his honest, they give him £2, and each keep £1 each.

This reduces each persons spend to £9 each. 3x9=27....

£2 went to shop owner.....making the total spent £29....

WHERE IS THE OTHER POUND?

It goes to the same magical place that the duplicate $2 you added came from

**Raxmei**

Orkeosaurus wrote:Now, do you choose the the rhino in the middle, or stick with the one on the left?

In this variation of the Monty Hall problem, each Rhino could equally be the right one. Stick with what you have.

If the Emperor does the usual variation, in which he knows the contents of all of the Rhinos and you know he would not open the winner Rhino to show you, you are better off switching Rhinos.

**Orkeosaurus**

Ah, but the Emperor is psychic.

How could he not know what was in the rhino?

(Yeah, I wasn't paying that much attention to my Monty Hall, as I was too busy thinking of the Emperor as a game show host. Oops!)

**Sidstyler**

I like thinking of the Emprah as a game show host. He floats around still plugged into his throne and communicates using his mind in that loud, annoying, game show host way.

Awesome.

**Raxmei**

Orkeosaurus wrote:Ah, but the Emperor is psychic.

How could he not know what was in the rhino?

He might well know what was in the Rhino, but his knowledge doesn't matter because he picked at random. As long as the choice is random (meaning that if the winning rhino was in the selection pool he could have picked it), each choice is equally likely to win.

On a side note, one poster on unspecified other 40k forum is really starting to get on my nerves. Can't make a legal army list to save his life, responds to criticism with hostility, and drank the lasgun kool aid. As in "Thats a slowed thing to say. Would I waste 10 points on a bolter when I could get 10 Lasguns?" He is by no means representative of unspecified forum, but posts at high enough volume to really annoy me.

**Orkeosaurus**

Alright, I got another one.

The Emperor comes down from his throne and says "man, sitting on a throne made from gold is uncomfortable!"

Then he looks at you. "That reminds me! Which is heavier, citizen: a pound of gold or a pound of feathers?"

**Raxmei**

Orkeosaurus wrote:Alright, I got another one.

The Emperor comes down from his throne and says "man, sitting on a throne made from gold is uncomfortable!"

Then he looks at you. "That reminds me! Which is heavier, citizen: a pound of gold or a pound of feathers?"

Pound of feathers. Gold is normally weighed in troy pounds, which are only about 82% the weight of the avoirdupois pounds used to measure nearly everything else.

**Orkeosaurus**

Damn. You're on to me.

**Fifty**

Mad Doc Grotsnik wrote:Confusing Maths time!

3 people each chip in £10 for a £30 model.

After the purchase, the shop owner remembers that model had £5 of it's price, and so gives them £5 change in £1 coins.

To thank him for his honest, they give him £2, and each keep £1 each.

This reduces each persons spend to £9 each. 3x9=27....

£2 went to shop owner.....making the total spent £29....

WHERE IS THE OTHER POUND?

Better way of answering this than the above;

It should not be £27+2 = £29
It should be £27-2 = £25

A fun little bit of misdirection though.

**Axyl**

Orkeosaurus wrote:Now, do you choose the the rhino in the middle, or stick with the one on the left?

If you've seen the movie 21, then you already know the answer....

Anyway, without getting into the maths of it. Basically you want to switch as you will have a 66.7% chance that the other one is the one with the credits.

**J.Black**

I think Mad Doc's been sniffing the recurring number formula again....

It is, on the other hand, a fine example of how calculations can go awry.

If anyone's interested in an example of how 2=1 PM me