can anyone provide the answer for the puzzle below

There are 25 horses,in each race only 5 horses can
participate.how many races are required to select best 5
horses out of 25.

need answer with detailed explanation

Answer Posted / amit

the answer is 9 races

let the horses be raced as -

race 1 - 1-5
race 2 - 6-10
race 3 - 11-15
race 4 - 16-20
race 5 - 21-25

in race 6, the winners of the 5 racs run, so we get to know
the fastest

the 2nd placed horse from the original race of the winner
can be the 2nd fastest or the 2nd placed horse from race 6
can be the 2nd fastest, so these 2 run in race 7. also for
the 3rd fastest, besides these 2 above horses, the 3rd
placed horse from the original race of the winner can be
the 3rd fastest, the 3rd placed horse from race 6 can be
the 3rd fastest or the 2nd placed horse from the original
race of 2nd finisher in race 6 can be the 3rd fastest. this
gets us the 5 horses which will run in race 7 and we will
get to know the 2nd & 3rd fastest horses

there will be 4 more horses which we will check for being
the 4th fastest, which run the race 8 and 5 more horses
which we check for being the 5th fastest, which run the
race 9 and after race 9, we get the top 5 fastest horses

Is This Answer Correct ?    2 Yes 3 No



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