by Marty » Fri Aug 06, 2010 12:36 pm
This riddle has probably already been posted in some way or another, but here it is:
A man has bags of gold. The number of bags is variable (number of bags = x). Each bag has the same amount of coins. The number coins in the bags is variable (number coins in each bag = y). One of the bags is full of counterfeit. These coins look exactly the same as the real coins. The only way one can tell the difference between the two types of coins is by the slight change in weight, the real coins weigh 1/8 pound and the fake coins weigh 1/10. (these facts don't really matter, the point is that one can't tell the difference between the two by putting them in his hand) Now, there is a scale. The person can use this scale to way the coins. However, there is a catch, one can only use the scale once, for only one reading.
How can the man find out which bag contains the fake coins?