Enigmatic Code

Programming Enigma Puzzles

Tag Archives: by: David Bedford

Puzzle #22: The 9-minute egg

From New Scientist #3248, 21st September 2019 [link] [link]

I like my eggs to be boiled for exactly 9 minutes. The problem is that I have no way to measure time except for two egg timers that are able to measure precisely 4 and 7 minutes respectively.

There is more than one way to set up the timers to measure exactly 9 minutes, but I am keen to eat my egg as soon as possible. Can you help?


Puzzle #14: The H coins problem

From New Scientist #3241, 27th July 2019 [link] [link]

Seven coins have been placed in the “H” shape above. Altogether there are five lines of three, including the diagonals.

Your challenge is to place two more coins so that you can make 10 straight lines of three. No stacking of coins or other sneaky trick is required.

If you find a way to do this, give yourself a silver medal. If you find a second way to do it that isn’t a mirror image of the first, award yourself a gold.


Puzzle #09: The cake and the candles

From New Scientist #3236, 29th June 2019 [link] [link]

Lady Frederica von Battenberg has baked a long, thin rectangular cake for her daughter Victoria. She has picked two random points on top of the cake on which she has placed two candles.

She hands the cake knife to Victoria, who now proceeds to pick a random point along the length of the cake, and cuts across the cake at that point.

Now that the cake has been cut in two, what is the chance that both pieces of cake have a candle on them?


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