Download PDF by C. R. Wylie Jr.: 101 Puzzles in Thought and Logic

By C. R. Wylie Jr.

Clear up homicide difficulties and robberies, see which fishermen are liars and how a blind guy can determine colour — in simple terms by way of reasoning! Hours of mind-strengthening leisure.

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However, a troy ounce is only 10% heavier than an avoirdupois ounce. The larger difference between the two measures is that a troy pound contains only 12 troy ounces, whereas an avoirdupois pound contains the familiar 16 ounces. This means that an ounce of gold weighs more than an ounce of feathers but a pound of gold weighs less than a pound of feathers. Can we switch to the metric system now? Please? 30 Chapter 2 General Questions and 2 pounds in a kilogram, there are 30 ounces in a kilogram.

The very improbable detail? According to my friends, the beer belonged to our former governor! (“Now at an improbability factor of a million to one against and falling,” D. ) 36 Chapter 2 General Questions 37 HINT: What is the population of the world? HINT: How much time do you spend each day talking on your cell phone? HINT: What fraction of time do you spend talking on your cell phone? ¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿¿ How many people are talking or texting on their cell phones at this instant? 8 ANSWER: The key insight to solve a problem like this is that the fraction of time the average person spends doing some activity is equal to the fraction of people doing it right now.

Alternatively, we can estimate the number of travel lanes and estimate the time per car per lane. Let’s start with the second. The GWB has two levels, with about eight lanes per level. This means that there are eight inbound lanes. 5 × 104 cars per hour. Now let’s estimate the traffic flow from the number of toll booths. The GWB has a lot of toll booths. There are definitely more than ten and fewer than one hundred, so let’s take the geometric mean of thirty. The automatic toll booths can process one car every 3 to 4 seconds.

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