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2015-03-19T22:09:31+05:30
Number of people = 5000
75 litters water requires for 1 people
75*5000 litters water requires for 5000 people
375000 litters water requires for 5000 people
volume of water in overhead tank = 40*25*15 m³ = 40*25*15*1000 litters
so 
number of days = 40*25*15*1000/375000
                       = 40 days
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