Latest Elitmus Aptitude Question SOLUTION: Given 91 horses, a> find the best 4 horses with minimum number of races. Each race can have only 9 horses. You don't have a timer. b> find the minimum races by which we know that

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(#M40028852) ELITMUS question Quant Keep an EYE

Given 91 horses,
a> find the best 4 horses with minimum number of races. Each race can have only 9 horses. You don't have a timer.
b> find the minimum races by which we know that one horse surely in top four?

Asked In Elitmus rahul (11 years ago)

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rajveer singh  (11 years ago)

a & b both have the same answer I.e. 10...

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Amardip Gautam  (11 years ago)

Ans a.)min 18 races
b.)min 18 races18
explanation:-
we dont know dat 4 best horses are in a single group of 9 or in different. So we will carry out race b/w 9 horses and filter out 5 of them,the remaining 4 best horses are again included in the next group like this way:
initially,91,(91-5),(91-5-5) and so on....
So to filter out best of all 90 horses, we have to carry out race for at least 91/5=18 remainder 1(best horse).

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naga sarath chand  (11 years ago)

a-18
b-11. i think this is correct

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kapil gupta  (11 years ago)

there is amistake that there are 81 horses instead of 91

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