What is greater that god,
More evil than the devil,
The poor have it,
The rich need it,
If you eat it you'll die?
When you stop and look,
you can always see me.
If you try to touch you cannot feel me.
I cannot move, but as you near me,
I will move away from you. What am I?
You have ten stacks of identical looking gold coins.
Nine of the stacks contain all real gold coins,
and one of the stacks is made up entirely of fake gold coins.
Each real gold coin weighs exactly 1 gram,
while each fake gold coin weighs exactly 1.1 grams.
Using a scale, how can you determine the stack of fake coins?
RULES: You can use to take only one measurement.
For example, you stack what you want on the scale,
press a button, and get a readout of the weight.
You can do this only once, and once the readout
is displayed it does not change if you remove any coins.
You can mix the coins up in their stacks, separate them,
mark them, whatever.
How do you find out for sure which stack
contains the fake gold coins?
