Plep's Puzzles

Monday, December 18, 2006

Water Puzzle

There are three glasses on the table - 3, 5, and 8 oz. The first two are empty, the last contains 8 oz of water. By pouring water from one glass to another make at least one of them contain exactly 4 oz of water.

Monday, December 11, 2006

Square Spiral

Imagine a line running 100 paces east. Then from the end of that line, plant a line 100 paces north, then 100 west, 98 south, 98 east, 96 north, 96 west, and so on. This makes a square spiral path 2 paces wide. How long is the path?

Monday, December 04, 2006


Ten letters are placed in ten pre-addressed envelopes at random. What is the probability that exactly nine letters were placed in the proper envelope?