SOLUTION: Ten men can dig a trench in 4 days.How many men would dig the same trench in 2 days,working at the same rate?

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Question 1109020: Ten men can dig a trench in 4 days.How many men would dig the same trench in 2 days,working at the same rate?
Found 2 solutions by Alan3354, ankor@dixie-net.com:
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
1/2 the time --> 2x as many men

Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Ten men can dig a trench in 4 days.
Find the number of man-days to dig one trench
10 * 4 = 40 man-days
:
How many men would dig the same trench in 2 days,working at the same rate?
let m = no. of men to do this
2d = 40
d = 40/2
d = 20 men to do it two days