## Einstein's riddle

Einstein wrote this riddle last century and said that 98% of the world’s population would not be able to solve it.

Are you a part of that 98%?

* There are 5 houses that are each a different colour.

* There is a person of a different nationality in each house.

* The 5 owners drink a certain drink. They each smoke a certain brand of cigarettes and also have a certain pet. No owner has the same pet, smokes the same brand of cigarettes nor drinks the same drink.

The question is. “Who has the fish?”

CLUES

1. The British man lives in the red house.

2. The Swedish man has a dog for a pet.

3. The Danish man drinks tea.

4. The green house is to the left of the white house.

5. The owner of the green house drinks coffee.

6. The person that smokes Pall Mall has a bird.

7. The owner of the yellow house smokes Dunhill.

8. The person that lives in the middle house drinks milk.

9. The Norwegian lives in the first house.

10. The person that smokes Blend, lives next to the one that has a cat.

11. The person that has a horse lives next to the one that smokes Dunhill.

12. The one that smokes Bluemaster drinks beer.

13. The German smokes Prince.

14. The Norwegian lives next to a blue house.

15. The person that smokes Blend, has a neighbour that drinks water.
 and yes, i am in those 2% who have been able to solve this problem. it took me about 45-50 minutes to solve it. if you find out the answer, please do mention the time it took you to solve it.
 Recognitions: Homework Help I've solved this a few years back, I think in 15 to 20 min.

## Einstein's riddle

This was posted several months ago in the General Discussion forum. I took around 30 minutes, but I think I was only 14 back then. I also solved this problem right before bedtime, and I was really tired - so much for Einstein's claim that only 2% of the world's population will be able to solve this.
 I found the link. Here it is.

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 Quote by recon so much for Einstein's claim that only 2% of the world's population will be able to solve this.
Don't forget the Flynn effect. We're just a lot smarter than Einstein's generation !
 Recognitions: Homework Help Science Advisor Took me about.. I don't know... 40 minutes or so. Didn't exactly time it. Im more interested in the way all you solved it. I basically drew a schematic and noted all the possible pets, nationalities and so in each house, then eliminated possibilities according to the clues till I got the answer. It was pretty straightforward, but in one point I could not deduce a step directly from the clues. I had to make an assumption before I continued. After that I got to the answer straight away, so the assumption was apparantly correct. (unless there is more than 1 solution, but I think not). So, did any of you had to do this as well? Or could you do without?

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 Quote by Galileo Took me about.. I don't know... 40 minutes or so. Didn't exactly time it. Im more interested in the way all you solved it. I basically drew a schematic and noted all the possible pets, nationalities and so in each house, then eliminated possibilities according to the clues till I got the answer. It was pretty straightforward, but in one point I could not deduce a step directly from the clues. I had to make an assumption before I continued. After that I got to the answer straight away, so the assumption was apparantly correct. (unless there is more than 1 solution, but I think not). So, did any of you had to do this as well? Or could you do without?
I did it entirely in my head.

Just messin' with you... I wonder what sort of IQ it would take to do this entirely in one's head ? I'm guessing upwards of 180 deviation IQ ?

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 Quote by Curious3141 Don't forget the Flynn effect. We're just a lot smarter than Einstein's generation !
I did a small search on the Flynn effect. Here's what I found:

 The results of intelligence tests in different countries show that over the past century average IQ has been increasing at a rate of about 3 points per decade.
This confuses me. The average IQ is DEFINED to be 100.
Even if people are getting smarter, the average IQ will always be 100.
It's a relative measure. (Intelligence Quotient).
 Recognitions: Gold Member Science Advisor Staff Emeritus I find it extremely unlikely that Einstein would waste his time devising silly puzzles like this one.

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 Quote by Galileo I did a small search on the Flynn effect. Here's what I found: This confuses me. The average IQ is DEFINED to be 100. Even if people are getting smarter, the average IQ will always be 100. It's a relative measure. (Intelligence Quotient).

There are too many variables here for there to be a clear cut answer.

IQ tests are renormed but not as often as they should be. So a test devised in the 50s and not normed since then will read "high" if an average 21st Century individual is tested. The median value of the test scores would have apparently drifted upwards.

When a new test is devised, it has to be normed on a current representative population. This means that compared to the older tests, newer tests would tend to read lower but "truer".

Further complicating the situation is the observation that IQ tests devised 50 years ago test quite different things from the standardised tests of today. Now you have concepts like fluid vs crystallised intelligence, general intelligence, $g$, and "culture-fairness". Modern tests de-emphasise verbal skills and test logical thought and a fair bit of visuospatial skills.

Interestingly, verbal abilities have, on the whole, fallen compared to the older generation. Tests of verbal "IQ" may show a deficit in modern populations compared to the older ones. However, there seems to have been a compensatory increase in "real" intelligence, related to problem-solving ability. What's even more interesting is that the Flynn effect seems to be more pronounced for highly $g$-loaded tests that are supposed to be a better measure of true cognition. Hence many people believe the Flynn effect to be real, and due to factors like better in-utero and early childhood nutrition, more stimulating environments, etc. Perhaps even video games play a role.
 Hmm I figured out one way that it works out... in my head... but thats only if green is right beside white... which it ends being I think anyways I dunno... it worked for me doing this in your head isn't any harder than doing it on paper IMO...
 It took me 10 minutes roughly
 Recognitions: Homework Help Science Advisor I did this in grade 11 with two friends while we didn't listen in french class. Does that count?
 Where does one go about taking a true IQ test? Mensa?
 Curious- it is entirely solve able I worked on it for about 10 min, then me and my friend worked on it for about 10 more min. and got it. P.S. You can't expect only 2% of this group to be able to solve it. Remeber, this is a group of people who are interested in physics. And tend to have a higher IQ then the avg person. They also tend to be people who are good problem solvers. (Since most of experimental physics is just that)

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 Quote by Cosmo16 Curious- it is entirely solve able I worked on it for about 10 min, then me and my friend worked on it for about 10 more min. and got it. P.S. You can't expect only 2% of this group to be able to solve it. Remeber, this is a group of people who are interested in physics. And tend to have a higher IQ then the avg person. They also tend to be people who are good problem solvers. (Since most of experimental physics is just that)
I know. I never said only 2 % of this board's population would be able to solve it, I'd say more than half our members would probably be able to do it with ease; in fact, I suspect the proportion of people in the general population that would be able to solve this given an hour would be at least 5 %.

The Flynn effect is real though, and there I was making a serious point.