Interesting Question of the Day – 26 October 2018

You have 25 horses and you need to find the fastest three.

They always run at the same pace, you don’t have a stopwatch, and you can race up to five horses at a time.

What is the least number of races you need to run to find the three fastest.

The first new player to comment on the website with the correct answer wins a free drink at their next iQ Trivia show.

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2 comments on “Interesting Question of the Day – 26 October 2018
  1. Nathan says:

    I get 11.

    Run a random five.
    Take the top three horses from that race, then race those against another two randoms from the remaining twenty. Repeat until all horses have raced.

    • iqtrivia says:

      You can do it in less. Quite a few less actually.

      It’s all about structuring it so that you can eliminate horses based on what you know from races you’ve already run.