Question 706362
If 120 people can do 1 job in 90 days,
9 times as many people will take 1/9 as long
to do 1 job, so
1080 people can do 1 job in 10 days
1/4 as many people take 4 times as long 
to do 1 job, so
270 people can do the same work in 40 days