Question

A village has a population of 4000, requires 150 litres water per head per day. It has a tank measuring 20 m , 15 m , 6 m. How many days for the water is sufficient enough once the tank is made full.

Answer 1

$\text{Volume of the tank}=20m\times 15m\times 6m$
$=1800m^3=1800000l$
$\text{Volume of water consumed by 1 person in 1 day}=150l.$
Total volume of water consumed in a day by total population $=150\times 4000$

$\text{Required number of days}=\frac{\text{Volume of the tank}}{\text{volume of water consumed in 1 day}}$

$=\frac{1800000}{150\times 4000}=3\text{days}$