Centred

Tag: logic

  • Crossing A Dark Bridge – Hint

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    Ian France
    in

    Remember our intrepid explorers? They were trying to cross a rickety bridge with a run-down torch. If you need a reminder of the problem, find it here. If you’re struggling with it, here’s a hint to help you. Presumably you’re working on the principle that 2 people cross together and one brings it back for…

  • Crossing A Dark Bridge

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    by

    Ian France
    in

    I like this puzzle. 4 people need to cross a rickety bridge after dark. In order to cross it, they must have a torch with them. They all move at different speeds: the first could cross the bridge in 1 minute; the second in 2 minutes; the third in 5 minutes; and the fourth in…

  • Prisoners’ Escape: Answer

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    Ian France
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    So, have the prisoners escaped? I like to think they did. But how did they maximise their chances? If you haven’t seen it, read the original puzzle here; and get a hint here, if you need it. Here’s what the prisoners should have decided: when the first prisoner goes in, they should open their number…

  • Prisoners’ Escape – Hint

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    Ian France
    in

    A couple of weeks ago, I set you a puzzle based on prisoners escaping their captivity. Read it here if you haven’t seen it. If you’ve given it some thought and are struggling with it, here’s a hint for you. Clearly they’re not going to just open lockers at random. Think about, as a prisoner…

  • Prisoners’ Escape

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    by

    Ian France
    in

    Here’s an interesting puzzle for you. One hundred prisoners are kept in a prison (obviously!). One day the prison warder comes by and tells them that they have a chance to escape. The downside is, that if they fail to escape, they will all be executed. In order to facilitate this escape, they are given…