SOLUTION: 18 men can dig a ditch in 10 days. After they have worked for 4 days how many more men shall be employed to complete the work in 4 days from then?

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Question 472609: 18 men can dig a ditch in 10 days. After they have worked for 4 days how many more men shall be employed to complete the work in 4 days from then?
Answer by ankor@dixie-net.com(22740) (Show Source):
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18 men can dig a ditch in 10 days.
After they have worked for 4 days how many more men shall be employed to complete the work in 4 days from then?
:
Determine the no. of man-days required to do the job
18 * 10 = 180 man-days
:
Let m = no. of additional men required to complete the job in 4 more days
The original 18 men will work a total of 8 days
:
(18*8) + 4m = 180
144 + 4m = 180
4m = 180 - 144
4m = 36
m =
m = 9 men required
:
:
Check this by finding the total man-days
18*8 + 9*4 = 180