12 pumps working 6 hours a day can empty a completely filled reservoir in 15 days. How many such pumps working 9 hours day will empty the same reservoir in 12 days

12 pumps working 6 hours a day can empty a completely filled reservoir in 15 days. How many such pumps working 9 hours day will empty the same reservoir in 12 days
1). 15
2). 9
3). 10
4). 12

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