SOLUTION: If 30 men need 16 days for a task, how many men would need 20 days?

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Question 485273: If 30 men need 16 days for a task, how many men would need 20 days?
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
Let all job is 1
If 30 men need 16 days for a task,then 30 men in 1 day do 1%2F16 part of job, 1 man in 1 day does %28%281%2F16%29%29%2F30=1%2F%2816%2A30%29=1%2F480 part of job.
In 20 days 1 man does 20%2A%281%2F480%29=20%2F480=1%2F24 part of job
All job (1) in 20 days will be finished by 1%2F%28%281%2F24%29%29=1%2A%2824%2F1%29=24 men