Puzzles with Weighings

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Heavy Weight
Heavy Weight
after Martin Gardner
Two weighings are required to identify the heavier thing among the four identical ones. Two weighings are required for the nine things as well. But how on it in the latter case?..
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Fish's Weight
Fish's Weight
after Martin Gardner
This classic puzzle gem easy shows that sometimes it can be not very easy to understand how much a simple half of a whole is.
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Red, White, and Blue Balls
Red, White, and Blue Balls
after Martin Gardner
It's known there is one heavier ball in each of the three pairs. Now the object is using a balance scale in just two weighings to determine the light and the heavy balls in each pair...
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Last Updated: January 19, 2011 top
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