[Pulze] The Weighing game

["Do / Ngoc Minh (ISE)" <n.do@student.canberra.edu.au>]

Dear pulze lovers,

I know another interesting pulze.  Hope you will like it.
Minh.

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You have 12 coins, labelled A, B, ..., L. One of them is a fake. It is a 
different weight to the others.
You also have a pair of scales which you can use to weigh coins against 
other coins. You are permitted 3 weighings, and you have to identify the 
fake coin and whether it is lighter or heavier than the genuine coins.
For each weighing, you have to decide which coins to put on the left 
scale and which to put on the right scale. You will be told which side is 
heavier.
For instance, you may choose to put coins A, B, C on the left scale and 
D, E, F on the right scale.
Then if A was the fake and it was lighter, the right scale would go down.
On the other hand, if the fake was one of G ... L, the scale would stay 
level.