Computer Logic Puzzles by Siobhan Allen https://padlet.com/siobhana/puzzle en-us 2017-11-20 12:44:02 UTC 2021-11-29 15:43:03 UTC hello@padlet.com Apples, Oranges or both? siobhana https://padlet.com/siobhana/puzzle/wish/1918010808 Attempt a solution before looking at an explanation ]]> 2021-11-29 14:21:07 UTC https://padlet.com/siobhana/puzzle/wish/1918010808 Knights or Knaves? siobhana https://padlet.com/siobhana/puzzle/wish/1918014030
Knights and Knaves

“Knights and knaves” are a popular type of logic puzzle that involves an island inhabited by two types of people: knights and knaves.

  • Knights always tell the truth
  • Knaves always lie
On the island, you encounter three people, Ted, Ben and Lil.

Ted says, “at least one of the following is true, that Lil is a knave or that I am a knight.”

Ben says, “Ted could claim that I am a knave.”

Lil says, “neither Ted nor Ben are knights.”

Who is a knight and who is a knave?

Here’s the solution.

]]> 2021-11-29 14:22:12 UTC https://padlet.com/siobhana/puzzle/wish/1918014030 Three fastest Horses siobhana https://padlet.com/siobhana/puzzle/wish/1918015689
Three Fastest Horses

We’d like to find the three fastest horses from a group of 25.

We have no stopwatch and our race track has only 5 lanes. No more than 5 horses can be raced at once.

How many races are necessary to evaluate the 3 fastest horses?

Here’s the solution.
]]> 2021-11-29 14:22:47 UTC https://padlet.com/siobhana/puzzle/wish/1918015689 A fake among 8 coins siobhana https://padlet.com/siobhana/puzzle/wish/1918045483 From Algorithm Puzzles book

There are eight identical looking coins. one of these coins is counterfeit and is known to be a little lighter than the qenuine coins. What is the minimum number of weighings needed to identify the fake coin with a 2-pan balance scale without weights.



Hint: 3 is not the answer



]]> 2021-11-29 14:32:47 UTC https://padlet.com/siobhana/puzzle/wish/1918045483 A stack of eight coins siobhana https://padlet.com/siobhana/puzzle/wish/1918053530 There are te stacks of 10 identical looking coins. All of the coins in one of these stacks are counterfeit, and all the coins in hte otehr stacks are genuine. Every genuine coin weighs 10g, and every cointerfeit coin weighs 11g. You have an analytical scale that can determine the exact weight of any number of coins. What is the minimum number of weighings needed to identify the fake coins?



Hint: the answer is 1. How?]]> 2021-11-29 14:35:36 UTC https://padlet.com/siobhana/puzzle/wish/1918053530 Truth tellers and liars - who is who? siobhana https://padlet.com/siobhana/puzzle/wish/1918066496 This puzzle uses a truth table which should help clarify.

Here is a link, but only look at the solution once you have given the puzzle some thought

https://brilliant.org/wiki/truth-tellers-and-liars/ ]]> 2021-11-29 14:40:06 UTC https://padlet.com/siobhana/puzzle/wish/1918066496 Truth tellers and liars - the path to doom siobhana https://padlet.com/siobhana/puzzle/wish/1918068502 https://suresolv.com/brain-teaser/liar-and-truth-teller-riddle-step-step-easy-solution]]> 2021-11-29 14:40:46 UTC https://padlet.com/siobhana/puzzle/wish/1918068502 12 coins counterfeit puzzle siobhana https://padlet.com/siobhana/puzzle/wish/1918082075 https://www.mentalfloss.com/article/90600/can-you-solve-counterfeit-coin-puzzle]]> 2021-11-29 14:45:29 UTC https://padlet.com/siobhana/puzzle/wish/1918082075 What's the middle number? siobhana https://padlet.com/siobhana/puzzle/wish/1918245978 https://www.theguardian.com/science/2021/nov/29/can-you-solve-it-yule-devour-these-festive-treats]]> 2021-11-29 15:43:03 UTC https://padlet.com/siobhana/puzzle/wish/1918245978