Length of the tank, l = 20 m
The breadth of the tank,b= 15m
Height of tank, h = 6 m
Total population of a village = 4000
Consumption of the water per head per day = 150 litres
We have to find for how many days will the water of this tank last
We know that Formula for volume of cuboid = l×b×h
The volume of the tank will be
Capacity of the tank=1800×1000litres=1800000litres
Let the water in this tank last for d days.
Water consumed by all people in d days = Capacity of the tank.
600000 d =1800000
d = 3
Therefore, the water in this tank will last for 3 days.