Difference between revisions of "Nine weights"

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A classic logic puzzle.
 
A classic logic puzzle.
 
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==Puzzle==
 
==Puzzle==
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On the table sit nine identical looking nuggets of gold.  However, you know that one of the nine is a clever forgery.  The only difference between the fake and the real nuggets is in weight: the fake gold weighs slightly less than the true gold.  Unfortunately, this weight difference is not great enough to be noticed in human hands.  Fortunately, you have a standard balance scale.  Unfortunately, you may only use the balance scale twice.  Fortunately, there is a way to find the fake gold even with these restrictions.  How?
 
On the table sit nine identical looking nuggets of gold.  However, you know that one of the nine is a clever forgery.  The only difference between the fake and the real nuggets is in weight: the fake gold weighs slightly less than the true gold.  Unfortunately, this weight difference is not great enough to be noticed in human hands.  Fortunately, you have a standard balance scale.  Unfortunately, you may only use the balance scale twice.  Fortunately, there is a way to find the fake gold even with these restrictions.  How?

Current revision as of 08:45, 7 July 2013

A classic logic puzzle.

Eo-scale of justice.gif

Puzzle

On the table sit nine identical looking nuggets of gold. However, you know that one of the nine is a clever forgery. The only difference between the fake and the real nuggets is in weight: the fake gold weighs slightly less than the true gold. Unfortunately, this weight difference is not great enough to be noticed in human hands. Fortunately, you have a standard balance scale. Unfortunately, you may only use the balance scale twice. Fortunately, there is a way to find the fake gold even with these restrictions. How?

See also

Twelve weights - you can use the scale three times to find a weight that is either lighter or heavier. Quite a challenge.

Six weights - you can use the scale twice to locate the heavy weight in each of three colors.