work and time
posted by suraj .
If 15 men or 24 women or 36 boys can do a piece of work in 12 days, working 8 hours a day, how many men must be associated with 12 women and 6 boys to do another piece of work 9/4 times as great in 30 days working 6 hours a day?

Convert the rates to work/mandays or work/womandays, etc.
So rate1=job/12*15*8 manhours
rate2=job/12*24*8 femalehours
rate2=job/12*36*8 boyhours.
Finally, the equation is
9/4 job = Xmen*6hrs/day*30days*rate1+ 12women*30days*6hrs/day*rate2 + 6 boys*30days*6hrs/day *rate3
solve for Xmen.
Respond to this Question
Similar Questions

work
b)5 men can do equal amount of work as 8 women. If 3 men and 5 women combinely do job in 10 days, then how many woman required to finish it in 14 days? 
Math
3 men and 4 boys can do a piece of work in14 days , while 4 men and 6 boys do the same work in 10 days . How long would it take one man to finish the same work? 
English
There are about twenty of us, men and boys, working here in the valley.  Q1 What is the relationship between 'us' and men and boys'? 
math
A man,a woman and a boy can complete a piece of work in 20,30 and 60 days respectively.How many boys should join 2 men and 8 women to complete the work in 2 days? 
math
20 men can do a piece of work in 24 days. After working for 6 days, additional men are employed to finish the work in 21 days from the beginning. Find the number of additional men 
math
Two men and six boys can cut a field in 3 hours. If the men work at 3/2 times that of the boys, how many men are required to cut the field in 2hours? 
math
40 MEN CAN DO A PIECE OF WORK IN 30 DAYS,WORKING 8 HOURS DAILY.IN HOW MANY DAYS WILL 60 MEN FINISH THE WORK WHEN WORKING HOURS ARE REDUCED BY 25 PERCENT? 
Maths ( urgent help )
20 men can do a piece of work in 24 days. After working for 6 days, an additional number of men are taken to finish the work in 21 days from the beginning. Find the number of additional men . . . I tried using variation method but … 
math
2 men and 5 boys can do a piece of work in 4 days, while 4 men and 4 boys can do it in 3 days.How long it would take one man alone to do it and how many days ity would take one boy to do it alone? 
math
24 men can do a work in x days and 32 women can do the same work in (x+8)days.the ratio of work done by 15 men and 12 women in the same time is 3:1,find value of x?