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Download e-book for iPad: 536 PUZZLES & CURIOUS PROBLEMS by H Dudeney

Posted On March 30, 2017 at 5:01 am by / Comments Off on Download e-book for iPad: 536 PUZZLES & CURIOUS PROBLEMS by H Dudeney

By H Dudeney

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Extra resources for 536 PUZZLES & CURIOUS PROBLEMS

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47 15. The Subway Shuttle NASA’s space missions are expensive. Consider NASA’s New Horizons probe, which left on an Atlas 5 rocket for a nine-year journey to Pluto. The total mission cost was about $650 million, but this is a difficult number for many to comprehend. Let’s put it into perspective. Most people consider subway fare fairly cheap. W HAT PER MILE : THE PROBE OR THE NEW YORK COSTS MORE SUBWAY? ASK YOURSELF THIS… A) What’s the distance to Pluto? B) How far do you travel on the subway? C) What’s the cost of a subway ride?

Assume that the average woman has three children in her lifetime. • A typical lifespan is about 80 years = 29,200 days. • If women have three children during their lifetime, then on any given day the probability that a woman chosen at random is giving birth is 3 out of 29,200 or about 1/10,000xii. xii The reader may note that we haven’t taken into account whether the woman chosen at random is of childbearing age. Since she is chosen at random, we have no way of knowing if she’s 4 years old, 24 years old, or 79 years old.

8 x 10 m) to the Moon. 8 x 105 mi. 02 per mi. 02 mi ≈ $9600 ANSWER: Neil Armstrong could have gained about $9,600 worth of frequentfliers miles on his trip to the Moon. According to Expedia, that’s roughly worth 11 free round trips from New York to Hawaii, 10 free round trips from Boston to Tokyo, or less than one one-millionth the cost of a trip from Earth to the Moon on the Apollo program. 55 19. Sex Sells— So Who’s Buying? Of all of the things that fascinate us humans, sex seems to be at the top of the list.

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