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 not easy half. discover connections and establish hidden relationships till all of sudden the solutions are showing as though via magic. remedy events 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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Answer on page 75. 30 Many Rivers to Cross +++ Let's take a break from puzzles and go on a rowboat ride across the river. There are four adults who want to cross it. They come upon a boy and a girl playing in a rowboat. 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.

Des. Here's a puzzle that will help you visualize a crystal pattern. Suppose you coat a tennis ball with glue. What is the maximum number of tennis balls that can attach directly to this sticky surface? Answer on page 92 Testy Target ••• Ten arrows are shot at the target below. One of them misses the target completely. The others all strike it. If the total sum of points is one hundred, in which part of the target did each arrow strike? Answer on page 92. 61 Eighth Century Enigma ••• Here's a puzzle that can be traced back to the eighth century.

Some pugwigs are kahoots. All kahoots are zingzags. Which of the following statement(s) must then be true? 1. Some zadohs are zingzags. 2. Some kahoots are zadohs. 3. All kahoots are pugwigs. 4. Some zingzags are pugwigs. 5. All zingzags are zadohs. 6. Some zadohs are kahoots. Answer on page 84. 44 Square Pattern • • -+ Suppose you have to paint all nine squares in the grid below using one of three colors: red, blue, or green. How many different patterns can you paint if each color must be represented in every row and every column?

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