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yonesbones loves solving puzzles at PuzzleFry.com. I am proud PuzzleFry member and like my time invested in solving brain teasers.
  • My answer is 11.

    First you split the 25 horses into 5 groups of 5. The puzzle tells us that we can’t measure speed, only relative speed, so we can’t compare horses across races. Thus, we have to take the top 3 horses of each race.  (5 races)

    Next, we have 15 horses so we split them into 3 groups of 5. We again take the top 3 of each group.  (3 races)
    Then, from the remaining 9, we form one group of 5 and take the top 3, adding it to the remaining 4. (1 race)
    Now we have 7 remaining, we form another group of 5 and take the top 3, adding it to the remaining 2. (1 race)
    We now have 5 horses left and we can form our top 3 in this final race. (1 race)

    Add them up and you’ve got 11 races.

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