A certain number of men can complete a Job in 30 days. If there were 5 men more, it could be completed in 10 days less. How many men were in the beginning?

A certain number of men can complete a Job in 30 days. If there were 5 men more, it could be completed in 10 days less. How many men were in the beginning?
1). 10
2). 15
3). 20
4). 25

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