SOLUTION: Twenty men did 1/4 of a job in 8 days. Then, because of an emergency, it became necessary to complete the job in the next 5 days. How many additional men were added to the crew of

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Question 300148: Twenty men did 1/4 of a job in 8 days. Then, because of an emergency, it became necessary to complete the job in the next 5 days. How many additional men were added to the crew of 20 to accomplish this?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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Twenty men did 1/4 of a job in 8 days.
:
Find the total number of man-days to complete 1/4 of the job
20 * 8 = 160 man-days
:
Then, because of an emergency, it became necessary to complete the job in the next 5 days.
How many additional men were added to the crew of 20 to accomplish this?
:
Let x = no. of additional men required
:
3 * 160 = 480 man-days required to complete the remaining 3/4 of the job
:
(x+20)*5 = 480
5x + 100 = 480
5x = 480 - 100
5x = 380
x = 380%2F5
x = 76 additional men required to complete the job in 5 yrs.
:
:
Check: 5(76+20) = 480 man-days