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?
Select.
A) 8 hrs
B) 7 1/2 hrs
C) 7 hrs
D) 9 hrs
E) 19 hrs
As it is not given, in how many days 40 men have to complete the job, so considering same days(=20) in which 30 men completes the job.   So If 40 men works for 'x' hours/day for 20 days, then Total men hours=30*20*9 = 40*20*x   x=(30*20*9)/40*20)= 27/4= 6 3/4   ANSW19 hrsR:19 hrs
<result>E</result>
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?