9 men working for 7 hours a day can complete a piece of work in 20 days, in how many days can 7 men working for 10 hours a day complete the same piece of work?

9 men working for 7 hours a day can complete a piece of work in 20 days, in how many days can 7 men working for 10 hours a day complete the same piece of work?
1). 21 days
2). 22 days
3). 20 day
4). 18 days

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