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Topic: 7+7=12? (Read 1696 times) |
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Aurora
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Prove that seven is half of twelve.
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| « Last Edit: May 25th, 2007, 8:32am by Aurora » |
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fatball
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Can anyone help me think outside the box please?
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Re: 7+7=12?
« Reply #1 on: May 25th, 2007, 8:33am » |
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folding the paper 
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Aurora
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Re: 7+7=12?
« Reply #2 on: May 25th, 2007, 10:45pm » |
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Sorry fatball, not quite sure where you're coming from, you'll have to explain. 
Either that or my brain's not quite switched on this early on a Saturday morning.
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"In these days, a man who says a thing cannot be done is quite apt to be interrupted by some idiot doing it."- Elbert Green Hubbard
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jollytall
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Re: 7+7=12?
« Reply #3 on: May 25th, 2007, 10:51pm » |
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Ask the Romans instead.
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fatball
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Re: 7+7=12?
« Reply #5 on: May 26th, 2007, 6:42pm » |
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on May 25th, 2007, 10:45pm, Aurora wrote:| Sorry fatball, not quite sure where you're coming from, you'll have to explain. |
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Combine my answer with jollytall's Roman letter answer.
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Aurora
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Re: 7+7=12?
« Reply #6 on: May 27th, 2007, 12:28am » |
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Thought that was probably what you meant, just wanted to check.
As I said, my brain's not always up and running that early!
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"In these days, a man who says a thing cannot be done is quite apt to be interrupted by some idiot doing it."- Elbert Green Hubbard
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Grimbal
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Re: 7+7=12?
« Reply #7 on: May 27th, 2007, 5:30am » |
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Else we could use the well-known fact that 1=0, that has been proven numerous times. 
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Sir Col
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impudens simia et macrologus profundus fabulae
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Re: 7+7=12?
« Reply #8 on: May 27th, 2007, 5:44am » |
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The following method fails slightly in addressing half of "twelve" being seven, but it does explain 7 + 7 = 12...
7 + 1 = 8
7 + 2 = 9
7 + 3 = A
7 + 4 = B
7 + 5 = 10
7 + 6 = 11
7 + 7 = 12
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ThudnBlunder
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Re: 7+7=12?
« Reply #9 on: May 27th, 2007, 5:56am » |
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and there is no solution to
SEVEN
+ SEVEN
--------
TWELVE
--------
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| « Last Edit: May 27th, 2007, 5:58am by ThudnBlunder » |
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THE MEEK SHALL INHERIT THE EARTH.....................................................................er, if that's all right with the rest of you.
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jollytall
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Re: 7+7=12?
« Reply #10 on: May 27th, 2007, 11:59am » |
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Btw. I think the captioned question is a typical example when a good riddle is rephrased into something that is almost the same, but still incorrect.
While in this case the original riddle was, as said in the first post as well: "Prove that seven is half of twelve." and it can be solved as hinted above, actually the hinted method does not give a solution to the captioned question of "7+7=12?" unless you use transparent paper. But because the riddle is so well known we simple omited this liitle fact.
If you want to phrase the question "A+B=C?" then you can try "6+4=9?" or "6+4=11?" instead.
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| « Last Edit: May 27th, 2007, 12:02pm by jollytall » |
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fatball
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Can anyone help me think outside the box please?
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Re: 7+7=12?
« Reply #11 on: May 27th, 2007, 9:42pm » |
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You don't need transparent paper, as long as you can see one side of the folded paper, that gives you the answer already.
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jollytall
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Re: 7+7=12?
« Reply #12 on: May 27th, 2007, 10:11pm » |
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How?
It is true then that 7 is the half of 12 (first post question).
But I do not see, how you can make 7+7 equal to 12 (question in the subject).
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Aurora
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Re: 7+7=12?
« Reply #13 on: May 27th, 2007, 10:49pm » |
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I didn't mean to cause any confusion. I only called the thread "7+7=12?" too avoid giving away the ridddle in the title. That was the title given when I first came across it. Although if anyone could prove this as well, I would like to know the answer.
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| « Last Edit: May 28th, 2007, 7:05am by Aurora » |
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"In these days, a man who says a thing cannot be done is quite apt to be interrupted by some idiot doing it."- Elbert Green Hubbard
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wangsacl
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Re: 7+7=12?
« Reply #14 on: May 28th, 2007, 2:40am » |
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I think this is the answer.
I don't know how to hide it, so you'll see many bars. After that is answers.
As you know 12 is XII, wroten in Roman Numerals. Divide XII with straight lines, to become XII. You see the top part, is VII. So, 12 divided to 2 is 7, or, 2 times 7 is 12, or, 7+7=12
I hope this is the right one.
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Aurora
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Re: 7+7=12?
« Reply #15 on: May 28th, 2007, 7:01am » |
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Welcome to the forum wangsacl.
That was the answer that I was looking for, (hinted at heavily by fatball and jollytall!). To hide something, highlight it and select the hide icon (far right, bottom row). At this stage in a thread, after big hints, hiding the answer isn't that important, it's just so that people browsing won't accidently stumble upon solutions.
In the meantime, enjoy solving the riddles!
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"In these days, a man who says a thing cannot be done is quite apt to be interrupted by some idiot doing it."- Elbert Green Hubbard
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Grimbal
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Re: 7+7=12?
« Reply #16 on: May 28th, 2007, 8:53am » |
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on May 27th, 2007, 5:56am, ThudanBlunder wrote:and there is no solution to
SEVEN
+ SEVEN
--------
TWELVE
--------
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Not in an even base, at least.
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ThudnBlunder
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Re: 7+7=12?
« Reply #17 on: May 28th, 2007, 10:10am » |
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on May 28th, 2007, 8:53am, Grimbal wrote:
Not in an even base, at least. |
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If you are looking for something to chew on, Grimbal, try this addition (base 10):
TWO
THREE
SEVEN
--------
TWELVE
--------
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THE MEEK SHALL INHERIT THE EARTH.....................................................................er, if that's all right with the rest of you.
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fatball
Senior Riddler
Can anyone help me think outside the box please?
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Re: 7+7=12?
« Reply #18 on: May 28th, 2007, 10:28am » |
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To start without much thought...
T must be 1 => W must be 0.
S can be 8 or 9 depending on the prevous column.
H+E=E is interesting. Since H cannot be 0, it has to be 9 for the equation to work, hence S must be 8.
The letters outstanding are E, R, V, L, N, O and the numbers outstanding are 2, 3, 4, 5, 6, 7.
To be continued...
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Grimbal
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Re: 7+7=12?
« Reply #19 on: May 28th, 2007, 11:30am » |
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Note that O and N are exchangeable.
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Icarus
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Re: 7+7=12?
« Reply #20 on: Jun 3rd, 2007, 3:18pm » |
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Just out of curiosity, who caught the significance of towr's thoughtful reply?
on May 26th, 2007, 9:29am, towr wrote:| An extra finger on each hand might explain it. |
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JiNbOtAk
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Re: 7+7=12?
« Reply #21 on: Jun 3rd, 2007, 5:53pm » |
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on Jun 3rd, 2007, 3:18pm, Icarus wrote:Just out of curiosity, who caught the significance of towr's thoughtful reply?
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Not sure myself, maybe A & B ?
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Sir Col
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Re: 7+7=12?
« Reply #22 on: Jun 3rd, 2007, 11:57pm » |
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on Jun 3rd, 2007, 3:18pm, Icarus wrote:Just out of curiosity, who caught the significance of towr's thoughtful reply?
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Just out of curiosity, who caught the significance of Sir Col's thoughtful reply to towr's?
(Actually I should have quoted him to make the connection more explicit.)
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TruthlessHero
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Re: 7+7=12?
« Reply #23 on: Jun 4th, 2007, 1:06am » |
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Can you provide a little more insight into A and B please? It's probably the hour, but I can't really put them together with everything.
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BNC
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Re: 7+7=12?
« Reply #24 on: Jun 4th, 2007, 1:53am » |
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on Jun 4th, 2007, 1:06am, TruthlessHero wrote:| Can you provide a little more insight into A and B please? It's probably the hour, but I can't really put them together with everything. |
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we (humans) have 10 finger, hence the decimal system with 10 digits (0..9).
Assume we had 6 fingers on each hand (12 overall). It is likelly we would have a 12-based (duadecimal?) counting system, with twelve digits. Call these digits 0..9,A,B.
If you add 7 and 7 using this system, you get 12, because 1212=1410.
You can simply try it: let's add 7 to 7:
7.. 8,9,A,B,10,11,12
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How about supercalifragilisticexpialidociouspuzzler [Towr, 2007]
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