SOLUTION: If 7 guys take 8 days to build a trench, how many guys will it take to build the trench in 1/2 day?

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Question 674348: If 7 guys take 8 days to build a trench, how many guys will it take to build the trench in 1/2 day?
Found 2 solutions by ewatrrr, josmiceli:
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

If 7 guys take 8 days to build a trench, 

how many guyshighlight%28x%29 will it take to build the trench in 1/2 day?

%28M%5B1%5D%2AT%5B1%5D%29%2FW%5B1%5D+=+%28M%5B2%5D%2AT%5B2%5D%29%2FW%5B2%5D

 7%2A8d+=+x%2A%281%2F2%29d

      112 guys = x

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
7 guys take 8 days for 1 trench
It takes 8 times as may guys to do 1
trench in 1/8 of that time, or 1 day, so
It takes 56 guys 1 day to do 1 trench
To do it in 1/2 that time will take twice as many guys
112 guys can do 1 trench in 1/2 day