Question

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

Answer 1

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