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# rookie1ja

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## Posts posted by rookie1ja

1. ### Hotel

Small Hotel - Back to the Logic Puzzles

13 people came into a hotel with 12 rooms and each guest wanted his own room. The bellboy solved this problem.

He asked the thirteenth guest to wait a little with the first guest in room number 1. So in the first room there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the twelfth guest to room number 11. Then he returned to room number 1 and took the thirteenth guest to room number 12, still vacant.

How can everybody have his own room?

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Hotel - solution

Of course, it is impossible. Into the second room should have gone the 2nd guest, because the 13th guest was waiting in room number 1.

13 men came into a hotel with 12 rooms and everybody wanted his own room. The bellboy solved this problem.

He asked the thirteenth guest to wait a moment with the first guest in room number 1. So in the first room there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ... and the twelfth guest to room number 11. Then he returned to room number 1 and took the thirteenth guest to empty room number 12.

How can everybody have his own room?

2. ### Puzzling Prattle (by Sam Loyd)

Puzzling Prattle (by Sam Loyd) - Back to the Logic Puzzles

Two children, who were all tangled up in their reckoning of the days of the week, paused on their way to school to straighten matters out. "When the day after tomorrow is yesterday," said Priscilla, then 'today' will be as far from Sunday as that day was which was 'today' when the day before yesterday was tomorrow!"

On which day of the week did this puzzling prattle occur?

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Puzzling Prattle - solution

The two children were so befogged over the calendar that they had started on their way to school on Sunday morning!

3. ### Twins

Two girls are born to the same mother, on the same day, at the same time (Edit: of course, not both at once - one right after the other - you know what I mean ), in the same month and year and yet they're not twins. How can this be?

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Twins - solution

The two babies are two of a set of triplets.

4. ### Photograph

Photograph - Back to the Logic Puzzles

I am looking at somebody's photo. Who is it I am looking at, if I don't have any brothers or sisters and the father of the man in the photo is the son of my father?

Or as the classic riddle goes:

Brothers and sisters, I have none

but this man's father is my father's son.

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Photograph - solution

I am looking at my son.

5. ### One-Way Street

One-Way Street - Back to the Logic Puzzles

A girl who was just learning to drive went down a one-way street in the wrong direction, but didn't break the law. How come?

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One-Way Street - solution

She was walking.

6. ### Cost of War

Cost of War - Back to the Logic Puzzles

Here's a variation on a famous puzzle by Lewis Carroll, who wrote Alice's Adventures in Wonderland.

A group of 100 soldiers suffered the following injuries in a battle: 70 soldiers lost an eye, 75 lost an ear, 85 lost a leg, and 80 lost an arm.

What is the minimum number of soldiers who must have lost all 4?

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Cost of War - solution

Add up all the injuries, and you find that 100 soldiers suffered a total of 310 injuries. That total means that, at a minimum, 100 soldiers (Edit: it is, of course, not 100 soldiers, but 100 as calculation from 310 person-injuries out of 400 possible) lost 3 body parts, and 10 (the remainder when dividing 310 by 100) must have lost all 4 body parts. (In reality, as many as 70 may have lost all 4 body parts.)

Edit: another way to solve it is to draw a line of 100 parts and compare injuries from opposite ends of the line, finding the intersection part of all 4 injuries. If left side of line (LS), right side (RS) and intersection (I), then:

70 (LS) and 75 (RS), then 45 (I)

45 (LS) and 85 (RS), then 30 (I)

30 (LS) and 80 (RS), then 10 (I) soldiers must have lost all 4 parts

7. ### Bavarian

Bavarian - Back to the Logic Puzzles

One glass has 10 cl of tonic water and another 10 cl of fernet. Pour 3 cl of tonic into the glass with fernet and after mixing thoroughly, pour 3 cl of the mixture back into the glass with tonic water.

Is there more tonic in the glass of fernet or more fernet in the glass of tonic?

(Ignore the chemical composition!)

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Bavarian - solution

There is exactly as much tonic in the glass of fernet as there is fernet in the glass of tonic.

Having 2 glasses, in one is 10 cl of tonic and in the other 10 cl of fernet. Pour 3 cl of tonic to the glass with fernet and after thorough mixing pour 3 cl of the mixture back to the glass with the tonic. Is there now more tonic in the glass of fernet or more fernet in the glass of tonic?

(Ignore chemical composition!)

8. ### Just in Time

Just in Time - Back to the Logic Puzzles

What occurs once in every minute, twice in every moment, yet never in a thousand years?

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Just in Time - solution

The letter m.

9. ### The Short Ones

The Short Ones - Back to the Logic Puzzles

• Why can't a man living in the USA be buried in Canada?

• Is it legal for a man in California to marry his widow's sister? Why?

• A man builds a house rectangular in shape. All sides have southern exposure. A big bear walks by, what color is the bear? Why? (similar to the Bear riddle in the section Einstein's Riddles)

• If there are 3 apples and you take away 2, how many do you have?

• How far can a dog run into the woods?

• One big hockey fan claimed to be able to say the score before any game. How did he do it?

• You can start a fire if you have alcohol, petrol, kerosene, paper, candle, coke, a full matchbox and a piece of cotton wool. What is the first thing you light?

• Why do Chinese men eat more rice than Japanese men? (Edit: Why do Chinese men eat more rice than Japanese men do?)

• What word describes a woman who does not have all her fingers on one hand?

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Pls visit New Puzzles section to see always fresh brain teasers.

The Short Ones - solutions

• Why should a living man be buried?

• No, it is not legal to get married if you are dead.

• The bear is white since the house is built on the North Pole.

• If you take 2 apples, than you have of course 2.

• The dog can run into the woods only to the half of the wood – than it would run out of the woods.

• The score before any hockey game should be 0:0, shouldn’t it?

• A match, of course.

• There are more Chinese men than Japanese men.

• Normal – I wouldn’t be very happy if I had all my fingers (10) on one hand.

10. ### Submit New Optical Illusions

Have you come across a beautiful illusion on the web? Share it here:

1. create account in these BrainDen forums

2. start new topic in this Illusions subforum

Have you seen our whole collection of optical illusions yet?

11. ### Wonderful New Puzzles

Have you heard/seen some wonderful puzzle that you really liked? Or maybe don't even know the answer? You can post it right here - just start a new topic for each new puzzle.

12. ### Stuck in Any Logic Game?

If you are stuck on some level of logic games published on my Brain Games page, you can paste a small screenprint here and there might be someone who could help you.

13. ### Can't see the trick?

Don't you know what to look for in the illusions published on my page (eg. Visual Illusions or Optical Illusions)?

Attach here the one you would like know the trick for and I will give you a hint.

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14. ### Solutions

First of all, solution for almost every puzzle published on my site (non-forum pages) is accessible via page http://brainden.com/solutions.htm. Link to that page is placed on all pages - check the top right hand corner for 'solutions'.

If you are interested in some particular puzzle and the provided solution is not clear to you, you can start a new topic.

I have written the Brain Teasers and Illusions gadgets in several languages. In particular, English, German, French, Spanish, Italian, Russian, Japanese and simplified Chinese. So if you have a google account and you have already added my gadgets (mentioned above) to your google home page, then you can see them in several languages (depending on what your country and language preferences are).

If you are a native speaker (of the 8 above mentioned languages), you can check them and find some bugs.

Have fun.

I am not a native speaker and I know that my site on Brain Teasers definitely needs some proofreading. You can make my site more attractive, make the puzzles more easy to understand, select the right words so that it's a real experience just to read the puzzles.

This is the right place where you can suggest any amendments to the wording as you would like it. For instance, my page on Paradoxes is written terribly.

The following Sitemap lists all my pages.

You can make this site better.

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