Download Great Critical Thinking Puzzles by Michael A. DiSpezio PDF

By Michael A. DiSpezio

Eighty puzzles. The solutions are effortless! yet getting there's the challenging half. discover connections and establish hidden relationships until eventually without notice the solutions are showing as though by means of magic. clear up occasions at the moon, round an insect-eating plant and gold-record racing via area within the Voyager spacecraft. ninety six pages, a hundred b/w illus., five 3/8 x eight 1/4.

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Sample text

The boat can hold either two children or one adult. Can the adults succeed in crossing the river? If so, how? Answer on page 76. 31 Train Travel ••• A train travels at a constant rate of speed. It reaches a stretch of track that has fifteen poles. The poles are placed at an equal distance to each other. It takes the train 10 minutes to travel from the first pole to the tenth pole. How long will it take the train to reach the fifteenth pole? fl£ASE, Relll\'s. ~ tF VOl' OotJIT ftGVf£ tT 11IT TH1S 1R'P~ t:O Answer on page 76.

Now, let's suppose that Coin A rolls completely around Coin B. If so, how many rotations does Coin A make around its own center? Answers on page 81. Painting on the Side ...... You are presented with several white cubes and a bucket of red paint. To make each of them different, you decide to paint one or more sides of each cube red. How many distinguishable cubes can you make with this painting method? Remember that any painted side must be painted completely to make it distinguishable from any other painted side.

Answer on page 79. Bagel for Five? ••• You and four friends have decided to split a bagel for breakfast. The five of you are not fussy about the size of the piece each will receive. In other words, all the pieces don't have to be the same size. D sing two perfectly straight cuts, is it possible to divide this bagel into five pieces? Answer on page 79. 36 Coin Moves ••• Place twelve coins in the pattern shown below. Notice how they form the corners of six equal-sized squares. Can you remove three of the coins to have only three equal-sized squares remaining?

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