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Radhika Bujji

· started a discussion

· 1 Months ago

I DIDNT UNDERSTAND THIS..CAN U PLZ EXPLAIN..... (Question: 388285.0 )

..

Question:

Six hundred and twenty five students enter a 100m race. The track has five lanes. At the end of each race the winner survives, while other four are eliminated. How many races are needed to determine the champion ?

Options:
A)

106

B)

156

C)

136

D)

166

Solution:

Ans: (b)

  

arpita

· commented

· 1 Months ago

consider that 125 slots of group of 5 students are made so that completes 125 races to select 125 winners among them
again in 125, 25 slots of group of 5 students are made to select 25 winner that completes 25 races more
lastly in those 25 students 5 slot of 5 student each are made to select 5 winners so again 5 races are completed n at last to select the final winner 1 race is need to be done
so 125+25+5+1=156

Knowledge Expert

· commented

· 1 Months ago

Total Number of student =625. At a time only 5 student can run. thus 625/5 = 125. this 125 candidate again runs and 25 winners in individual race 125/5=25 this 25 student again run 25/5= 5 finally this 5 candidate and run and 4 eliminated and one student winner. sum of total races conduct = 156 given in solution.

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