SOLUTION: 120 men can do a work in 90 days.How many more men are required to complete the work in 40 days?

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Question 421479: 120 men can do a work in 90 days.How many more men are required to complete the work in 40 days?
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
+%28%28120+%2B+x%29%2A40%29%2F%28120%2A90%29+=+1
40(120 + x) = 120*90
==> 120 + x = 270
==> x = 150 more men needed to finish the work in 40 days.