Question 674348
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