A village, having a population of 4000, requires 150 litres of water per head per day. It has a tank measuring `20"\ "m"\ "xx"\ "15"\ "m"\ "xx"\ "6"\ "m` . For how many days will the water of this tank last?

Explanation

Volume of the water tank `= (20 xx 15 xx 6)m^(3) = 1800 m^(3)`
Consumption of water per head per day
= 150 litres
`= (150 xx (1)/(1000)) m^(3) = (3)/(20) m^(3) " " [ :' " 1 litre" = (1)/(1000) m^(3)]`
Total consumption of water per day for 4000 persons
`= ((3)/(20) xx 4000) m^(3) = 600 m^(3)`
Required no. of days for which water of the tank will last
`= ("volume of water tank")/("consumption per day") = (1800)/(600) " days " = 3` days