[This is a nice puzzle from a Russian mathematics contest for 8th graders]
You have 100 coins. 96 of them have the same weight. The remaining 4 are lighter than the other 96, and those 4 have the same weight.
You are given a pan balance which has two pans, and you can compare if the objects in the left pan are heavier/lighter/equal to the objects in the right pan.
You are allowed to use this pan no more than 2 times.
Can you find a heavy coin?
[Solution]
You have 100 coins. 96 of them have the same weight. The remaining 4 are lighter than the other 96, and those 4 have the same weight.
You are given a pan balance which has two pans, and you can compare if the objects in the left pan are heavier/lighter/equal to the objects in the right pan.
You are allowed to use this pan no more than 2 times.
Can you find a heavy coin?
[Solution]
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