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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?
Wiki User
∙ 14y ago
if M1 persons can do W1 works in D1 days for T1 hours and M2 persons can do W2 works in D2 days for T2 hours
then M1D1W1T1=M2D2W2T2
here W1= W2 = same work
equation given: 30 x 9 = 40 x X
=> X = 30 x 9 /40
=270/40
= 6.75
= 6 hrs and 45 mins
Wiki User
∙ 12y ago
Wiki User
∙ 14y ago1) (# men) x (# days) x (# hours/day) = Total hours to complete the job.
2) Calculate total man-hours to complete the initial job. 30 men x 20 days x 9 hours/day = 5,400 total man-hours.
3) If the total job takes 5,400 hours to complete you just plug that back into your first equation this time using 40 men instead of 30:
(40 men) x (20 days) x ? hours = 5,400 total hours
divide both sides by 40
divide both sides by 20
Hours = 6.75
Wiki User
∙ 13y ago16
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