Brain Teasers and Puzzles

This is a thread where each poster gives a riddle or an answer to a previous riddle. I'll start it off with a simple riddle. There are at least two answers that I know of. What can you put in a barrel and make it lighter (can't remove the air and add a lighter composition of air or add a container of gas.)?

This isn't really a puzzle as there is no answer but it's generated an interesting line of debate before... I have a spherical ball. It is made of plastic and it is hollow. It is also blue. Is it more blue than it is spherical?

Here's a fun game that everyone can play. One person starts with a riddle, and gives everyone a week to try to guess the answer. Whoever guesses first gets to post their own riddle, and it goes on and on. If no one can get the riddle after a week, the answer will be posted along with a new riddle. Here's the starter: You use a knife to cut my head then weep beside when I am dead

There are 39 perfectly Spherical Metal Balls IDENTICAL to one another in Shape , Color and Weight. Except that just one of these Balls is DEFECTIVE and has a DIFFERENT WEIGHT compared to the Rest of the Balls. We don’t know whether this Defective Balls is HEAVIER or LIGHTER in Weight. We also don’t know which is this Ball out of the 39. We have Only a SIMPLE BLALANCE and nothing else to use [No Weight Units etc] Some of these Balls can by weighed in the scale against each other and any Inference taken counts for one Weighing ! In how many weighings can you detect the Defective Ball and what is the Procedure ? Remember, you need to also fin…

To test your mental acuity, answer the following questions I will give the link later! 1. Johnny’s mother had three children. The first child was named April. The second child was named May. What was the third child’s name? 2. A clerk at a butcher shop stands five feet ten inches tall and wears size 13 sneakers. What does he weigh? 3. Before Mt. Everest was discovered, what was the highest mountain in the world? 4. How much dirt is there in a hole that measures two feet by three feet by four feet? 5. What word in the English language is always spelled incorrectly? 6. Billie was born on December 28th, yet her birthday always falls in the summer.…

Well, i thought that this thing might be kind of interesting and thought it didn't look that obvious in the photo. Sort of a brain teaser. Try guessing what it is? and give your explanantion. Anyone?

not sure if this one is easy or not but i'll let ye decide. This sequence gives a five letter word: ijklmn maybe it is too easy, i hope it's not!

Hi everyone, Here is a question I first encountered in 2002. It was from the website http://www.highiqsociety.org/. Since then, they have taken the test that had this particular question down. Here is the question: Note: At first, Planck was spelled "Plank," but the webmaster at the original website stated that "Plank" was a typo (as stated on another forum - see below). Also, there may be some dispute about the spelling of "Block" (Bloch???) and Lippman (Lippmann???). Okay... my first thought was that this is an easy problem to solve. Simple linear algebra... right? This has proven to be a real bi*ch though.... An old (2002) discussion f…

Emily Lime likes a regal lager on a hot day. When she's hungry, she calls out "Yo, banana boy!" When she gets a headache, she takes one lonely Tylenol. Tell us more about her. Or just sit quietly, drab as a bard.

ok, my friend told me had a secret and that it was hidden in this message: 022902300248019701980216 the only hint he gave me was that the 0's were dividers. i thought i figured it out, but he told me i was wrong... here's what i got a +1 +18 -51 pattern and if u hold alt and type the #'s (including 0's) on aim it makes a pattern i have NO IDEA! anybody got any better ideas??

This is an old puzzle, but if you haven't seen it before it should make you think. You stand before two identical doors. On door leads to a long and rewarding life, the other door leads to sudden death. Before each door is a guardian who, if you ask him the correct question will tell you which door to take. However one guardian always lies and the other always tells the truth. You don't know which one lies. You are only allowed one question. You walk up to a guardian and ask him the one question you are allowed and he tells you which door to take. What is your question?

White moves to mate in two ! What is the first move ?

http://riddle.kaoskorruption.deltaanime.net This riddle is super hard but lots of fun. I think it's new. I've gotten to level 5. See how far you can get.

Well, the title is quite self-explanatory. So, what are your favorite logic puzzles and why? (I'm running short and need new ones!) My favorite so far is probably the blue-eyed islanders puzzle. It took me long enough to solve it, but I managed to do so without cheating. I like puzzles that seem counter-intuitive at first. So here's a version of the puzzle:

A buddhist monk makes a usual journey up the mountain. He leaves at dawn from the bottom and arrives at the top just in time to see the sunset, stopping a number of times along the road to eat and meditate. At the top he rests the whole night and leaves again the next morning at dawn. During his way down he stops along the road to meditate and eat and arrives at the bottom in time to see the sunset. At which point along the road did the monk cross at the same exact time both days?

There is a 4 digit number which spells like "abcd". Jack, John and James tries to find this number. Jack only know the range of the digits(biggest -smallest).John only knows a+b+c+d.James knows a*b*c*d. Jack says: I dont know all the digits but James doesn't either. James says: I dont know all the digits but John doesnt either. John says: I just found it and Jack should be just found it as well. What is the four digits ?

Five aging pirates decided to split their treasure and to retire. Each one will be satisfied if in his estimate his share is not smaller than one fifth of the total. Their estimates vary. How can they do it peacefully?

This one of those puzzles which some people get straight away but others spend ages over. It's called Mrs Tilly and you have to work out what Mrs Tilly likes and what she dislikes. Ok i'll start.... Mrs Tilly likes to giggle but not to laugh. Mrs Tilly likes to be seen but never heard. Mrs Tilly likes the Moon but not the Sun Mrs Tilly likes darkness but not the light Mrs Tilly likes the unnecessary and hates the ordinary. If you work it out add your own one.

what is used to bat with and next to a ball that`s never hit?

Hi all! I found an intelligence test online: http://www.intelligence-test.net/part1/ Supposedly, if you get 19 or up right, then you're a genius. How accurate is this test? *optional: What was your score, mine was 15

So if a person were to jump of a building of some considerable height (say 10 stories) but on a table, and he jumps of the table before impact, would he survive or not. I feel he wouldn't, but i wanted your opinion. PS: Had no clue where to post this and hence here!

Ok, I will post a riddle, and after about 10 replies (guesses) to the riddle I will give the actual answer...I'll start There are 3 objects- One is hungry and will never be full- One has gone and will never return- One is here and will never leave- What are the 3 objects? (I realize that the answer may not scientifically be true, but its just a riddle)

The isosceles triangle ABC has AB = AC and angle BAC = 20 degrees. The point D lies on AC such that angle DBC = 60 degrees. The point E lies on AB such that angle ECB = 50 degrees. Find angle EDB.

I think there was already a thread (not on the brain teaser and puzzle forum) that had this question so if you saw the answer, please do not post it. Thanks. Anyway, how is .999... equal to 1? It's actually simple, but a lot of people have a hard time figuring it out.