BRAIN TEASERS THREAD

[MatthewRyan]

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RIDDLE #2 - DIFFICULTY RATING 8.5/10

You have 12 coins, 11 weigh the exact same amount but one (you don't know which) is of a different weight (you also don't know whether its heaver or lighter. you have a scale, using 3 weighings figure out which coin is the odd one and whether it is heavier or lighter.

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can somone please post the answer

[shootaa]

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It takes 10 men 8 days to dig 13 holes. How long would it take one man to dig half a hole?

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answer in white:
<font color="white"> obv no such thing as 1/2 hole, one scoop = hole </font>

[BiPolar_Nut]

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We have 3 cannibals and 3 explorers and a boat that has the capacity for 2 ppl. How do you pass all 6 persons safely from one side fo the river to the other of the river?
If there is ever more cannibals than explorers on either side the cannibals will eat the explorers.

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Why not just do one of each on each trip??

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Because the boat is assumed to not have a "Return empty to other shore without getting swept down the river" device.

[samsonite2100]

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We have 3 cannibals and 3 explorers and a boat that has the capacity for 2 ppl. How do you pass all 6 persons safely from one side fo the river to the other of the river?
If there is ever more cannibals than explorers on either side the cannibals will eat the explorers.

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answer in white below

<font color="white">
1) CCC EEE
2) C EEE --------------------&gt; CC
3) CC EEE &lt;------------------ C
4) EEE ----------------------&gt; CCC
5) C EEE &lt;-------------------- CC
6) C E ----------------------&gt; CC EE
7) CC EE &lt;------------------- C E
8) CC -----------------------&gt; C EEE
9) CCC &lt;---------------------- EEE
10) C -----------------------&gt; CC EEE
11) C E &lt;--------------------- CC EE
12) -------------------------&gt; CCC EEE </font>

[siegfriedandroy]

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players with higher career averages have more at bats in years where everyones averages were higher and/or fewer when their averages were lower?

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makes sense