The best riddles. Anywhere.

Riddle: 25 Horses

You have 25 horses. When they race, each horse runs at a different, constant pace. A horse will always run at the same pace no matter how many times it races.

You want to figure out which are your 3 fastest horses. You are allowed to race at most 5 horses against each other at a time. You don't have a stopwatch so all you can learn from each race is which order the horses finish in.

What is the least number of races you can conduct to figure out which 3 horses are fastest?

You can figure it out with 7 races. See if you can figure out how! A little hint: you can learn the most information about the most horses by first separating them into completely separate racing groups.

Want the solution? You need to log in with your Google account.

Previous Riddle: None
Next Riddle: 40 Pounds in the Balance