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

• 30 men takes 20 days and in each 9 hrs.... so 1 man 1 hr work=1/30*20*9,
  so, 40 men work 1 hr work=1/135 , so 40 men 1 day work=15/2 hrs
• 10 years agoHelpfull: Yes(13) No(15)
• 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
  800x = 5400
  x = 5400%2F800
  x = 6.75 hrs a day for 20 days to do the same job
  
  
• 10 years agoHelpfull: Yes(11) No(4)
• 20 men can complete the work in 180 hours so,
  40 men can done the work in 20*180/40=135 hours
  so,working 9 hours in a day 40 men can finish the job in 15 days
• 12 years agoHelpfull: Yes(5) No(20)
• In both cases days are same
  so
  m1*ti=m2*t2
  30*9=40*t2
  t2=270/40=71/2hrs
• 8 years agoHelpfull: Yes(4) No(6)
• In how many days?
  
• 12 years agoHelpfull: Yes(2) No(4)
• 30 men take 20 days to complete a job working 9h a day.
  40 men take same 20days then working hours per day is:(30*9)/40===6.85 hours
• 12 years agoHelpfull: Yes(2) No(7)
• Qn is incomplete.
  
  @ SACRETIES
  As per given qn.
  I think 30 men ( and not 20 )can complete the work in 20*9=180 man hrs.
• 12 years agoHelpfull: Yes(1) No(5)
• question itself wrong for sure..bcoz this is a hexaware placement paper question and its typed by a guy who remembers half only....these are sample questions for hexaware...work out like these questions(for tat only he typed but all took it as full question itself)!!
• 12 years agoHelpfull: Yes(1) No(12)
• 
  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
  800x = 5400
  x = 5400%2F800
  x = 6.75 hrs a day for 20 days to do the same job
• 9 years agoHelpfull: Yes(1) No(3)
• Assume days are same.
  30*9=40*x
  x=6.75
• 6 years agoHelpfull: Yes(0) No(1)
• 30*20*40=no. of days req. =15
  9 hrs a day for 20 days work, per day=9/20hrs
  so for 15 days , no of hrs = (9/20)*15=6.75 hrs
• 6 years agoHelpfull: Yes(0) No(0)
• so in the first sentence --> 30 * 9 * x = 20 * 24 , x is ration value
  so x =16/9
  
  now in second sentence --> 40 * y * x= 20 * 24 , y is the no of working hours a man has to do and i have taken 20 * 24 , as the job needs to be completed in 20 days ( correct me if i am wrong)
  so x=16/9 , we got it previously
  and y=6.85hrs
  so if we convert it , we get 7 hrs 25 min , so close to 7 1/2 hrs , so ans is (b)
• 5 years agoHelpfull: Yes(0) No(0)
• m1*ti=m2*t2
  30*9=40*t2
  t2=270/40=71/2hrs
• 2 years agoHelpfull: Yes(0) No(0)