Latest Wipro Aptitude Question SOLUTION: 30 men take 20days to complete a job working 9 hours a day. how many hour a day should 40men work to complete the job? a. 8hrs b. 7 1/2 hrs c. 7 rs d. 9 hrs

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30 men take 20days to complete a job working 9 hours a day. how many hour a day should 40men work to complete the job?
a. 8hrs
b. 7 1/2 hrs
c. 7 rs
d. 9 hrs

Asked In Wipro deepanya.m (10 years ago)

Unsolved Read Solution (8)

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Read Solution (8) :

Devendra Marghade  (10 years ago)

6.75 hours
If number of (days=20) remains same
hours/day for 40 men to complete the job= (30*20*9)/(40*20)=27/4= 6 3/4 =6.75

Is this solution Helpfull? Yes (19) | No (1)  

poonam  (10 years ago)

let 40 men take x hours .
so according to time work hour equation
(men)(day)(hour) of 1st = (men)(day)(hour) of 2nd
so x = (30 *20*9) / (40)(20)
x = 6.75

Is this solution Helpfull? Yes (9) | No (2)  

ritu raj  (10 years ago)

30 men takes 20 days then 40 men will take 15 days to complt the wrk nwo
30*20*9=40*15*x(hours) after solving x=9 hrs
ans=9hrs

Is this solution Helpfull? Yes (8) | No (13)  

anand kumar  (10 years ago)

one men in one hour = (1/20)*(1/9)*(1/30)
so 40 men can do work in one hour = 1/(15*9)
let they do x hours a day and work should be completed in 20 days = (x*20)/(15*9)=1
so x= (15*9)/20=27/4 is approx to 8 hrs

Is this solution Helpfull? Yes (5) | No (10)  

soumya  (10 years ago)

30 man's 1 day work = 1/9 hrs
1 man's 1 hrs work = 1/(9*30)
40 man's 1 hrs work = 40/(9*30)
= 4/27
total hour in a day the work shd complete = 27/4 = 6.75

Is this solution Helpfull? Yes (3) | No (1)  

Shailesh Kumar Singh  (4 years ago)

The question it self having the answer. "how many hour a day should 40men work to complete the job?". Here they haven't mentioned the number of days. Read the question again, how many hour a day "should" 40men work to complete the job. They should work for 9 hours only, that is why 6.75 is not included in question. (One of the best example of trick questions)

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RITURAJ SUMAN  (10 years ago)

MD/W=constant
Applying this formula let no of hours are 'x'a day and works for 'y' days
Then 30*20*9=x*y*40 => xy=135
since we have to find hours per day, divide by options
135/8=16.875 (its asking hours a day, but answer is implying day in fraction,so this is not a answer)
similarly, answer 7 is eliminated.
its either 7.5 or 9

Is this solution Helpfull? Yes (1) | No (9)  

SAIPRASANTHREDDY  (10 years ago)

30 MEN-9HRS A DAY-20 DAYS;I,E 1 MEN 1/270th OF WORK IN 1 DAY.THEN 40 MEN CAN DO WORK IN 40*1/270=6.75

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