Riddle me this, Riddle me that!

Roomys_ZA said:
Ok Seems Lyt is out. Ill continue for this week.

You have 3 light switches outside a door, 1 of these turns on a light inside the room, the light switch can be in the ON or OFF position only before you enter the room. You may only enter the room once to decide which of the 3 switches controls the light.

Please ask any questions if unclear.
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if the switched is on the ON side I would see light coming from under the door and if its on the OFF side there would be no light showing so I will switch the switches till I see some light.
 
Lets just say the only time you see light ( assuming you hit the correct switch on ) is when you open the door - you cant see anything through cracks.
 
How about turn on each switch until an outside light doesn't go on, then that one is probably the inside light
 
This mite take a while :

Flip the first switch on and make sure two and three is off and wait 5 or so mins, then turn it off. Turn on the second switch, and have 1 and 3 off. Enter the room now - if the bulb is on, no 2 is the right switch. If it is off, touch the bulb - if it is warm then it was switch 1, if not warm then it will be switch 3.
 
Wyvern said:
This mite take a while :

Flip the first switch on and make sure two and three is off and wait 5 or so mins, then turn it off. Turn on the second switch, and have 1 and 3 off. Enter the room now - if the bulb is on, no 2 is the right switch. If it is off, touch the bulb - if it is warm then it was switch 1, if not warm then it will be switch 3.
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Yup....So cleffah!!

Your up !
 
Old one but maybe no one knows it.

You have two empty containers – one has a capacity of five litres of water and the other can hold at most three liters of water. Both containers are made of clear plastic and have absolutely no markings anywhere. Here’s your challenge: given an unlimited supply of water, I want you to come up with a way to measure exactly four litres of water.
 
Wyvern said:
Old one but maybe no one knows it.

You have two empty containers – one has a capacity of five litres of water and the other can hold at most three liters of water. Both containers are made of clear plastic and have absolutely no markings anywhere. Here’s your challenge: given an unlimited supply of water, I want you to come up with a way to measure exactly four litres of water.
Click to expand...

Fill up the 5 litre bottle then pour the water from that into the 3 litre bottle, you'll have 2 litres left in the big bottle. Empty out the small bottle, then pour the 2l into the small bottle. Now you have 2 litres in the 3 l bottle. Now fill up the 5 litre bottle again then use that water to fill up the 3 litre bottle, you will now have 4 litres left in the big bottle.
 
Oh I remember this one. Let's see if I remember how to work it out

1. Fill the 5l container
2. Fill the 3l container from the 5l container (leaving 2l in the 5l container)
3. Empty the 3l container
4. Pour the 2l into the 3l container (leaving 1l of empty space in the 3l container)
5. Fill the 5l container
6. Fill up the 3l container (1l space) from the 5l container, leaving exactly 4l in the 5l container

EDIT: ^^ Eugene is too quick
 
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