☯☼☯ SEO and Non-SEO (Science-Education-Omnilogy) Forum ☯☼☯
Non - SEO knowledge => Philosophy => Topic started by: MSL on May 27, 2014, 01:43:26 PM
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A thread to post interesting puzzles, brain teasers,
logic problems and so on
I've decided to start a new thread in this omnilogical community and, concretely, to put it in the philosophy board.
The main idea behind this thread is to post many good brainteasers, logical problems, puzzles...
I welcome you!
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Playing Cards Trick
(http://www.seo-forum-seo-luntan.com/pics/Playing cards.jpg)
The certain magician tells you he’s going to amaze you with an interesting trick. He then invites you to do the following:
a) Open a brand-new deck of playing cards, place them face down on the table.
b) Count off the top twenty cards, turn them face up, and insert them at random into the remainder of the deck.
c) Shuffle the deck thoroughly.
d) Count off the top twenty cards and hand them to him under the table.
After a period of "magic" activity under the table, he places his pack of twenty cards next to yours of 32. He says, he has arranged that both packs now contain the same number of face-up cards. You count and... they do!!! How did he do this trick?
ANSWER: Simply by turning over the whole pack of twenty cards. (This guarantees that both packs will contain the same number of face-up cards.)
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A gender problem
(http://i48.tinypic.com/2ut0vvl.jpg)
In a fictional kingdom, boys and girls are born in strictly equal proportion. Determined to increase the proportion of men in the land, the king issues a decree: Any woman who bears a daughter is forbidden to have any further children. He reasons that some families will thus contain multiple sons but a single daughter. Years later the king is very confused to find that the kingdom still contains an equal number of boys and girls! :o Why is that?
ANSWER: The first set of births after the king’s decree will be half girls and half boys. But so will every subsequent set. The number of births will diminish steadily, but this won’t affect the ratio of girls to boys.
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7 Letters
(http://www.seo-forum-seo-luntan.com/pics/26 letters.jpg)
Imagine this:
A woman has 7 letters:
The 1st 2 stand for a boy or a man.
The 1st 3 stand for a girl or a woman.
The 1st 4 are a brave boy or a brave man
And the 1st 6 are a narcotic.
But all of her letters together stand for a brave girl or a brave woman.
What is she?
ANSWER: Heroine.
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2 bolts
(http://oi47.tinypic.com/2vacz6a.jpg)
OK, let's think now about this one:
Let's suppose that you have got 2 identical bolts. Hold each by its head, engage the threads together and revolve one about the other. Will this act pull the heads closer together or it will drive them farther apart?
ANSWER: Neither. ;D In effect one bolt turns clockwise, the other anticlockwise at the same rate, so the distance between their heads will remain unchanged. 8)
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Russian roulette problem
(http://www.seo-forum-seo-luntan.com/pics/Russian roulette.jpg)
We’re playing Russian roulette for fun. The revolver has six chambers, all empty. I put bullets in two adjacent chambers, spin the cylinder, hold the gun to the target in the field, and pull the trigger. It clicks. Now it’s your turn. Before pulling the trigger, you can choose:
a) to spin the cylinder again
b) leave it as it is.
Which is better for you? :)
ANSWER: It’s better not to spin it. Two of the six chambers are loaded, so my chance of winning was 4/6. But you know that the hammer fell on an empty chamber. Of the four empty chambers, only one is followed by a loaded one. So if you simply pull the trigger, you have a 3/4 chance of winning. That’s better than 4/6, so you’re better off not spinning the cylinder.
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A water problem
(http://i48.tinypic.com/27y4bo6.jpg)
A tank of water has 2 holes of equal size. 1 is near the top and 1 is near the bottom. The top hole leads to a downspout, so that both holes actually discharge their water at exact the same level. If we ignore the friction, which hole produces the faster water flow?
Can you solve this? 8)
ANSWER: The water flows from both holes at the same rate.
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Another one about water
(http://www.seo-forum-seo-luntan.com/pics/scale.jpg)
A scale balances a glass of water with a certain weight. If someone put his or her finger into the water and he or she is careful not to touch the glass, will it upset the balance?
ANSWER: Yes. The water imparts an upward force on your finger as you immerse it, so you must exert a downward force to overcome it. That force is transferred to the glass and then to the scale, which sinks.
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Smells like blue paint
What is red and smells like blue paint?
(http://www.seo-forum-seo-luntan.com/pics/paints.jpg)
ANSWER: Red paint.
Hehehe!!! ;D
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Bassoon-Train question
(http://www.seo-forum-seo-luntan.com/pics/Train.jpg)
You want to take your one-piece bassoon(You may learn more about this here -- http://en.wikipedia.org/wiki/Bassoon (http://en.wikipedia.org/wiki/Bassoon)) on the train, but the bassoon is 1.7 meters long and the baggage man won’t take any item whose greatest dimension exceeds one meter. What can you do?
ANSWER: The bassoon will fit diagonally in a cubical box ONE meter on a side. :)
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An interesting conundrum
(http://www.seo-forum-seo-luntan.com/pics/water from a bottle.jpg)
Let's imagine this... You have got 100 pounds of imaginary potatoes, which are 99% water by weight. You let them dehydrate until they’re 98% water. How much do they weigh now?
ANSWER: Perhaps surprisingly, these imaginary potatoes now weigh 50 pounds. The sack of potatoes originally weighed 100 pounds, and 1 percent of its weight, or 1 pound, was non-water. If that 1 pound now makes up 2 percent of the total weight, then the total weight must be 50 pounds.
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Foot size and performance in spelling bees
(http://www.seo-forum-seo-luntan.com/pics/feet.jpg)
There is a direct, positive correlation between foot size and performance in spelling bees(spelling tests). Can you explain this? ;D
ANSWER:Usually, the larger the feet, the older the person. :)
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Four
(http://www.seo-forum-seo-luntan.com/pics/watch.jpg)
Well, 4 hours ago, it was as long after 4 AM as it was before 4 PM the same day. What time is it right now?
ANSWER: It's 2 PM. The halfway point between 4 AM and 4 PM is 10 AM, but that was 4 hours ago. Thus 10 AM + 4 hours = 2 PM.
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A Peculiar Roman Numerals Equation
(http://www.seo-forum-seo-luntan.com/pics/Roman.jpg)
If you still don't know about the Roman Numerals, you may learn about them here: http://en.wikipedia.org/wiki/Roman_numerals (http://en.wikipedia.org/wiki/Roman_numerals) and now let's read this peculiar Roman numerals equation:
How would this equation be correct without changing it:
"XI + I = X" ?
ANSWER: Just turn it upside down. :)
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How many times
(http://www.seo-forum-seo-luntan.com/pics/clock.jpg)
How many times in 24 hours does a clock’s hands overlap?
ANSWER: 22 times.
AM: 12:00, 1:05, 2:11, 3:16, 4:22, 5:27, 6:33, 7:38, 8:44, 9:49, 10:55.
PM: 12:00, 1:05, 2:11, 3:16, 4:22, 5:27, 6:33, 7:38, 8:44, 9:49, 10:55.
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Letters Question
(http://www.seo-forum-seo-luntan.com/pics/Letters A to Z.jpg)
Insert 2 consecutive letters of the alphabet to make English words (they can be inserted at the beginning, middle or end) and note that the letters must be consecutive within the word, e.g. mae + uv = mauve. Try:
cin
aost
boat
Now try inserting three consecutive letters:
ine
cay
ack
ANSWER:
2 consecutive letters: cabin, almost, bobcat
3 consecutive letters: define, canopy, hijack
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A horse conundrum
(http://www.seo-forum-seo-luntan.com/pics/Horse conundrum.jpg)
A tsar is old and must will his fortune to 1 of his 2 sons. He makes a proposition. His two sons will ride their horses in a race, and whichever horse crosses the finish line last will win the fortune for its owner. During the race, the two brothers wander aimlessly for days, neither willing to cross the finish line. In desperation, they ask a wise woman for advice. She tells them something; then the brothers leap onto the horses and charge toward the finish line. What did the wise woman say? :)
ANSWER: The rules of the race were that the owner of the horse that crosses the finish line last wins the fortune. The wise woman simply told them to switch horses.
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Cake question
(http://www.seo-forum-seo-luntan.com/pics/Cake question.jpg)
How would you cut a rectangular cake into 2 equal pieces when a rectangular piece has already been cut out of it? (The cut piece can be of any size and orientation.) You are only allowed to make one straight cut.
ANSWERS: There are 2 solutions to this problem. Let’s start with the easiest solution. If you make one straight horizontal cut along the height of the cake, the resulting slices are of equal sizes. But this solution may not work so well on a cake with icing. So let’s rethink:
In general, when a straight cut is made at any angle through the center of a rectangle, the resulting pieces are always of equal area. So let’s consider our situation. What if we make a straight cut such that it passes through the center of both the rectangles? Since the cut halves both the rectangles, the resulting 2 pieces are guaranteed to have equal area. Each piece has an area equal to half the original cake minus half the area of the missing rectangular piece. This results in two pieces of equal size, assuming the cake’s height is same at all points.
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About puzzles in Wikipedia: https://en.wikipedia.org/wiki/Puzzle (https://en.wikipedia.org/wiki/Puzzle). And a recent photo of many puzzles from a local bookshop: (http://www.seo-forum-seo-luntan.com/pics/many puzzles.jpg). 8) Pretty! :)
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Yeah. Real puzzles. ;D