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Started By
Message
re: Brainteaser/Riddle Thread
Posted on 12/17/19 at 6:41 am to ISEN_AG
Posted on 12/17/19 at 6:41 am to ISEN_AG
quote:
You have 3 light switches in the attic that each control 1 bulb in the basement. How do you determine which switch controls each light while only going to the basement once?
Leave one on for a few minutes, then turn it off. Then flip a different one on. Go down to the basement. The hot one is switch 1, the lit one is switch 2, the cold one is the switch you didn't touch.
2
Posted on 12/17/19 at 6:45 am to Ingeniero
There’s only one bulb.
Posted on 12/17/19 at 6:51 am to OysterPoBoy
quote:
I feel like this is the secret. Don't even use the seesaw, it's a crutch. There has to be a better way. Can we ask them how much they weigh?
This. Unless the weight difference is minuscule, could you not tell which one either is bigger or smaller than the rest just by looking at them? Or like you said, ask them.
Posted on 12/17/19 at 7:46 am to Ingeniero
quote:
Leave one on for a few minutes, then turn it off. Then flip a different one on. Go down to the basement. The hot one is switch 1, the lit one is switch 2, the cold one is the switch you didn't touch.
It's 2019. The bulbs are LEDs and do not get hot enough to notice. Now how do you solve it?
Posted on 12/17/19 at 7:48 am to OysterPoBoy
quote:It's a brain teaser, not a math problem. If 11 of them weigh exactly the same, then the answer is simply the 12th guy is the one who weighs different
I feel like this is the secret. Don't even use the seesaw, it's a crutch. There has to be a better way.
This post was edited on 12/17/19 at 7:53 am
Posted on 12/17/19 at 8:18 am to yankeeundercover
Is the island Guam? Rep Hank Johnson(D Ga) says it might tip over!
Posted on 12/17/19 at 8:28 am to Yak
quote:
the answer is simply the 12th guy is the one who weighs different
but the riddle specifically asks “how do you determine”.
so the answer isn’t a person, but a process.
Posted on 12/17/19 at 8:34 am to tigerfoot
quote:
The different weight could be lighter
AHHHH I misread it. The old riddle is "which marble is heavier" not which is different.
My mistake! Shame me!
Posted on 12/17/19 at 8:34 am to Nutriaitch
quote:If it was a process, then you'd be forced to use the see saw...the riddle says you don't have to. It's filler commonly used in riddles to keep you guessing and not realize the answer was in front of you the whole time
but the riddle specifically asks “how do you determine”.
so the answer isn’t a person, but a process.
Posted on 12/17/19 at 8:38 am to Yak
the seesaw very well may be filler.
but the riddle specifically asks “how do you determine” and never once asks “who is”
so the answer to the riddle has to be a process.
that process may or may not involve the see-saw.
but the riddle specifically asks “how do you determine” and never once asks “who is”
so the answer to the riddle has to be a process.
that process may or may not involve the see-saw.
Posted on 12/17/19 at 8:39 am to TheCaterpillar
quote:
The old riddle is "which marble is heavier" not which is different.
OP admitted that he fricked it up. The original riddle states that one man is heavier, which is solvable in 3 moves. If you don't know whether the 12th man is heavier or lighter there is no guaranteed way to solve it in 3 moves.
Posted on 12/17/19 at 8:40 am to Yak
You have to use the seesaw, it's not a trick. I've figured out you have to start with 4 and 4, but haven't gotten past that. The outcomes are either a balanced seesaw, so you know the outlier is in the group of 4 currently not on the seesaw, or an unbalanced seesaw so you can eliminate the 4 not currently on it.
Posted on 12/17/19 at 8:41 am to LSUBoo
quote:
OP admitted that he fricked it up. The original riddle states that one man is heavier, which is solvable in 3 moves. If you don't know whether the 12th man is heavier or lighter there is no guaranteed way to solve it in 3 moves.
Ah, so my solution was right. VINDICATION!
4 v 4 to see which 4 has the fat man. (Eliminates 8/12 men)
2 v 2 to see which 2 has the fat man.
1 v 1 to see who is the fat man.
Posted on 12/17/19 at 9:00 am to Ingeniero
quote:
You have to use the seesaw
He said “if” you use the seesaw.
Posted on 12/17/19 at 9:27 am to TheCaterpillar
need to define a “use”
let’s say i put 6 guys on each side.
remove only a single person from each side, but other 5 on each side remain on.
is that one “use” since i never cleared the seesaw?
or does it count a 2 “uses” since the quantity on the seesaw changed?
let’s say i put 6 guys on each side.
remove only a single person from each side, but other 5 on each side remain on.
is that one “use” since i never cleared the seesaw?
or does it count a 2 “uses” since the quantity on the seesaw changed?
Posted on 12/17/19 at 9:31 am to yankeeundercover
quote:
If you use the seesaw, you can only use it three times.
This is the key. “I” never use the see-saw... the 12 men on the island do.
compare them 2 by 2 until you find = weight.
Then use one of those people to 1v1 to find the outlier.
Posted on 12/17/19 at 9:47 am to yankeeundercover
If you drown them all but 1... then you only have 1 man left and you don't need a seesaw.
Posted on 12/17/19 at 9:54 am to yatesdog38
You may be on to something with water. Remember, we’re on an island. Why don’t we just get them all to float and the one that floats easier or harder than the rest is the 12th man.
Posted on 12/17/19 at 10:27 am to OysterPoBoy
quote:
Why don’t we just get them all to float and the one that floats easier or harder than the rest is the 12th man.
not necessarily.
different people float differently not always just dependent upon weight
Posted on 12/17/19 at 10:27 am to yankeeundercover
You put 3 on each side.. this will give you a control group.. either first 6 on seesaw or those not on seesaw
Second time .. you remove one from one side of the group you know is off balance and place a control weight
This will give you the side of light or heavy.. or if you remove the skinny or fat then the answer
Third you take two from the determined off weight side. This will provide the answer
ETA. Now I think I’m wrong
Second time .. you remove one from one side of the group you know is off balance and place a control weight
This will give you the side of light or heavy.. or if you remove the skinny or fat then the answer
Third you take two from the determined off weight side. This will provide the answer
ETA. Now I think I’m wrong
This post was edited on 12/17/19 at 10:54 am
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