Logic puzzles, riddles, math puzzles and brainteasers - pzzls.com

Vandaag is het 20 January 2018

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Marching men - math puzzle

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   Rating: 2.7/5.0

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A long and straight row of soldiers is marching with constant speed. The dog of the commander runs along the row from the end till the beginning, from the beginning till the end, from the end till the beginning etc. This takes always 2 minutes, 1 minute, 2 minutes, etc.
At some point the soldiers have to pass a very small bridge. However, the commander does not trust the strength bridge completely. He wonders how much time it will take them to pass the bridge when they stay marching with the same speed. How much time is that?

The swamp - math puzzle

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   Rating: 3.0/5.0

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A rich earl has become the owner of a piece of land, which to his dissatisfaction turned out to be nothing more than a big swamp. The earl wants to get rid of the swamp. A salesman advises him to use his fast-growing plants which can cover the swamp very quickly. "This plant doubles every day, tomorrow you will have two, the day after tomorrow four, etc. In 80 days, your swamp will be completely covered." The earl reacts: "80 days? This takes far too much time. Then just give me eight of these plants."

Question 1: What did the earl think?
Question 2: And what do you think?

Number magic - math puzzle

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   Rating: 2.8/5.0

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If you multiply me by 2, subtract 1, and read the reverse the result you'll find me. Which numbers can I be?