Brain teaser thread

[thEnEuRoMancER]

14 is no prime?

Good night everyone.

 

[Zenmervolt]

vi_edit, even fluorscent lights get warm, just not hot. You would have to leave a fluorscent on for a longer period of time than an incandescent (sp?) light, but it will still get warm eventually.

Zenmervolt

 

[imhotepmp]

14 is the odd one out...its the only prime number

imhotep(MP)

edit:beat me to it

 

[imhotepmp]

If some coffee is "97 percent caffeine-free," how many cups of it
would one have to drink to get the amount of caffeine in a cup of
regular coffee?



imhotep(MP)

 

[nd]

I don't see why checking for warmth is any more "fair" than checking the wiring. Both are engineering-esque solutions.. and in this case I think you're only accepting the warmth one because it's more "clever". Stupid if you ask me

 

[Ken g6]

14 is the odd number out, but I feel compelled to point out that neither 1 nor 14 is a prime number. 14 is, however, the only even number in the list.

In other words, 14 is odd because it's not odd!

Let's see: 100%/3% = 33 1/3 cups.

 

[BigPoppa]

How bout,

There's a cabin on a mountain, 14 people die, how do they die?

 

[prodigy]

They killed themselves

 

[BigPoppa]

Ummm, no.

 

[prodigy]

They jumped off the mountain

 

[BigPoppa]

No.

 

[BigPoppa]

Damnit prodigy, this is easy!!!!

 

[BigPoppa]

Well, i'll let you guys think bout this one, i'll post the answer tomorrow after school if ya haven't got it.

 

[BiggieN]

i know it. the mountain is a volcano.

 

[tom3]

I'll add a geometry question.. go here to see the problem and come back here to report the answer.. if you can present your method, it would be even better..

 

[allan120]

airplane cabin.

this one is mathematical...how many people need to be in a group in order for there to be a 50% chance that two people in the group share a birthday? (Kindly disregard Feb. 29 , and no, the answer is not 183).

 

[BigPoppa]

Allen's right, an airplane crashed into a mountain. And i'll get back to you tomorrow on that one TOM3.

 

[guyver01]

Ok i got one.. it's old, but i like it.

Three men go to a motel and ask for a room. The desk clerk says they only have one room left, and he'll let them have it for $5 each. Each man pays his amount and they go to the room. A few minutes later the desk clerk decides he overcharged them for the room, takes 5 singles out of the cash register, gives it to the bellboy and tells him to give it back to the gentlemen. The bellboy decides 3 men cannot evenly split $5 so he keeps $2. He returns the 3 singles back to the men.
So now, each man paid $4 for the room. That's $12. The bellboy kept $2.... for a total of $14.. where's the missing dollar?

 

[BigPoppa]

There isn't one.

 

[Thanatopsis]

$15 dollars went out

The drawer has $10.
Each man has $1 (for a total of 3)
Bellboy has $2.
Total = $15

It doesn't work because you don't add the two that the bellboy takes, you subtract it. That way, the drawer would have $12, but the bellboy pocketed $2, which leaves the drawer with the $10 it should have.

edit: Tom3 the link doesn't work

 

[LegendOfTheBeerCan]

Easy. The men didn't pay 4 dollars per person per room.
They paid $3.33(non terminating) per person per room.
Note: the deskkeeper returned 5 dollars, but they paid a total of FIFTEEN dollars.
That so called dollar did not exist then.

So it seems to a beercan, at least.

 

[prodigy]

Did you register just to answer that questoin?

 

[vi edit]

An average cup of coffee has 150mg of caffine.
97% caffine free coffe has 4.5 mg of caffine.
To get 150mg of caffine, one would have to consume 33.3 cups of coffee.

 

[guyver01]

prodigy... lol.. just noticed.. he had 1 post... an answer.. lol

and Thanatopsis and LegendOfTheBeerCan had the correct "solution"

it's all a matter of perspective...

from the mens point of view.. they paid 4..

from the desk pov, they paid 3.33333333333333 each

 

[dopcombo]

Hehe...
how about this?

A man decides to commit suicide and jump off a tall building. On his way down, he hears a phone ringing somewhere in the building. Immediately he regrets jumping off.
Why?