Question

A village, having a population of 4000, requires 150 litres water per head per day. It has a tank which is 20 m long, 15 m broad and 6 m high. For how many days will the water of this tank last?

Answer 1

Total population of a village = 4000
Water required for 4000 persons for one day = $150\times 4000=600000$ litres
Length of tank (l) = 20 m
Breadth (b) = 15 m
Height (h) = 6 m
$\therefore$ Volume of tank = $l\times b\times h$
= $20\times 15\times 6m^3=1800m^3$
Capacity of water in the tank = $1800\times 1000$
l = 1800000 l $(1m^3=1000l)$
$\therefore$ Number of days, the water will last
= $\frac{1800000}{600000}$= 3 days.