12 pumps working 6 hours a day can empty a completely filled reservoir in 15 days. How many such pumps working 9 hours a day will empty the same reservoir in 12 days.
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Let x be the required Pumps
Pump-----Hours ---- Day
12............6.............15
X................9..............12
x =6/9x15/12x12 = 10 Pumps
10 pumps are required to empty
the reservoir
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