A Question of Logic: Volume 3

3D

Shango said I could do one.

There's a door. In front of the door is a scale. The only way to open the door is by placing exactly four litres of water on the scale.

You have two jugs. One can hold 5 litres, and one can hold 3. Yet you need four litres...

The rules are you can only fill, empty and pour the contents of one jug into the other.

How do you get four litres exactly?

3D. Wrestling Clique, Monksdiner, JimmyVan and KnowYourNews' Crafty Old Veteran.

Dr. Giganto

This was in the movie Die Hard With a Vengeance, although they didnt actually show Bruce Willis and Samuel L. Jackson doing it.

First, you fill the 3-litre jug all the way, then put it into the 5-litre jug. then you do it again, but after filling the five-litre jug, you are left with one litre in the 3-litre jug

Then, you empty the 5-litre jug and pour in the one litre that is currently in the other jug. Now, you have one litre in the 5-litre jug. Fill up the three litre jug, add it to the one litre in the 5-litre jug, and voila, 4 litres exactly

Papa Shango

Or, alternatively you could fill the 5 litre jug.. fill the 3 litre jug with it so you are left with two litres in the 5 litre jug.

Empty out the 3 litre jug.. pour the remaining 2 litres into the empty 3 litre jug.

Refil the 5 litre jug.. then fill up the 3 litre jug.. thus leaving you with 4 litres. in the 5 litre jug

Papa Shango

There is a town in Texas where 5 percent of all the people living there have unlisted phone numbers. If you selected 100 names at random from the town's phone directory, on average, how many of these people would have unlisted phone numbers?

AudioSavior

none because their numbers are unlisted lol.

Papa Shango

good call Ida!

A Man rides into town on Monday. He stays for 3 days and leaves on Monday.

How is that possible?

Dr. Giganto

he rides in on a horse named Monday

Papa Shango

Well Done sir.

Does anyone else have any silly brain teasers to post?

your not dumb Mr D.. im sure you have some puzzlers to post.

DMW

Juggling them would not work. An analysis of the vector forces at work would prove that. Assuming that you're holding one ball at all times, that makes your weight 101 lbs. By throwing a second ball in the air, the equal and opposite reaction would create a downward force making your total weight (it's hard to be precise when you're not using the metric system) greater than 102 lbs.

AudioSavior

To that affect, simpley walking would cause you to weigh more....