SOLUTION: 20 men can do a piece of work in 24 days. After working for six days an additional number of men is taken to finish the piece of work in 21 days from the beginning. Find the number

Question 603164: 20 men can do a piece of work in 24 days. After working for six days an additional number of men is taken to finish the piece of work in 21 days from the beginning. Find the number of additional men?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
"20 men can do a piece of work in 24 days."
Find the number of man-days to complete the job
20 * 24 = 480 man-days
;
After working for six days an additional number of men is taken to finish the piece of work in 21 days from the beginning.
:
let a = no. of additional men
(20*6) + 15(a+20) = 480
120 + 15a + 300 = 480
15a = 480 - 420
a =
a = 4 additional men required to finish in 21 days
:
:
Check this
120 + 15(24) = 480
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