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Thirty men take 20 days to complete a job working 9 hours a
day. How many hour a day should 40 men work to complete the job?
(a) 8 hrs
(b) 7 1/2 hrs
(c) 7 hrs
(d) 9 hrs
- 35 Answers
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Answer / mahalakshmidevi prathivada
30 * 20 * 9 = 5400 man-hours required to complete the job
:
Let x = no. hrs a day to do the same job (assuming in 20 days)
40 * 20 * x = 5400
800 x = 5400
x = 5400% 800
x = 6.75 hrs a day for 20 days to do the same job
| Is This Answer Correct ? | 2 Yes | 0 No |
Answer / mastermind00181
No need to worry about it. the work has already been done those 20 persons. So why do u need to do same job ? read the question carefully.
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / pradipta
30 men takes 20 days & 9 hour to complete 1 job
(Here days constant, only hour is asked)
So 30 men, Each day 9 hour, 20 days =9*20=180 hrs
Den 1 men takes 180*30=5400 hrs
Therefore 40 men will take 5400/40=135hours in 20 days
=135/20=6.75 hours each day
Answer is c (approximately 7 hour)
| Is This Answer Correct ? | 0 Yes | 0 No |
Answer / sanjeev kumar
since 30 men take 20 days to complete this job working 9
hours per day
so (30*9)/40
=27/4
= 6 3/4 hours
so option is not correct...
| Is This Answer Correct ? | 0 Yes | 0 No |
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