12 men sea-saw riddle

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bobbyDK

There are 12 men on an island. 11 weigh exactly the same amount, but 1 of them is slightly lighter or heavier. You must figure out which… The island has no scales, but there is a see-saw. The exciting catch? You can only use it three times.”

can you find the solution without looking on the internet?

neverland_creature
Ask them who's the heaviest and who's the lightest!
neverland_creature
Why is there a seesaw on an island?
bobbyDK

you cannot ask them, they don't know, and the seesaw is part of the riddle.

ijgeoffrey
[COMMENT DELETED]
ijgeoffrey

You only need two uses of the see-saw.

1: place six men on each side of the see-saw. It will not be balanced.

2: Take the six men who were on the lower end, divide them into two groups of three, and place them on the see-saw. If the see-saw balances, the 12th man was lighter. If the see-saw does not balance, the 12th man was heavier.

neverland_creature
Wait are you trying to find out which man is heavier or lighter or are you trying to find out whether he is heavier or lighter?
ijgeoffrey

I thought I was trying to find out whether the man was lighter or heavier. I may have misunderstood, which would explain why it was so easy...

neverland_creature
Idk I am really confused....
bobbyDK

here is the puzzle explained https://www.youtube.com/watch?v=Cs-TGLxQfBM (the prize is not included.)lol

ijgeoffrey
That still doesn't help me Bobby. Do I need to figure out *whether* the man is lighter or heavier (which I already did), or *who* is lighter or heavier?
bobbyDK
ijgeoffrey skrev:
That still doesn't help me Bobby. Do I need to figure out *whether* the man is lighter or heavier (which I already did), or *who* is lighter or heavier?

it is the tricky part not knowing if the person is either heavier or lighter.

ijgeoffrey

Ok. I can find who the 12th man is, *and* whether he is heavier or lighter, in only two uses of the see-saw.

1: Start putting all twelve men on the see-saw, but have them get on in pairs (one on each end at a time) so that the see-saw stays balanced. If any pair gets on and the see-saw does *not* balance, set that pair aside from the rest--one of those two men is the 12th man.

2: Place the man from your pair who was on the lower end of the see-saw back on it, and balance him against any of the other 10 men. If these two balance, then the other man you set aside in step 1 was the 12th man, and he was lighter. If the men in step 2 do not balance, the man you placed on the see-saw is the 12th man, and he is heavier.

bobbyDK

that was actually the solution I wanted to use my self but it isn't right.

PremiumDuck

In which hemisphere is the island? Is it tropical or just like a rock in the ocean? Do you have access to a shark ,a plasma cutter and a mirror?

bobbyDK

click here if you want to see the solution. it is quite awesome.

scroll down to all mapped out

https://realviacauchy.wordpress.com/category/solutions/

Pai_Mei

12 is easy!


Try 13. 

bobbyDK
PremiumDuck skrev:

In which hemisphere is the island? Is it tropical or just like a rock in the ocean? Do you have access to a shark ,a plasma cutter and a mirror?

who needs a shark?

let's say it is tropical. no it is 12 men so they have no mirror.

noone of them has a plastmacutter in their Every-day Carry (EDC) survival kit

Greensage11

What is considered a use?

mimansoob

why not just compare their feet depth on the sand of the island.. the one that has a deeper or closer hole on the surface of the beach is the one that differs.

Deeper hole = heavy

Closer hole to the surface = light