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.
[3 marks]

Answer 1

Volume of the tank = $l\times b\times h$
= 20 m × 15 m × 6 m
= 1800 $m^3$ [∵ 1 $m^3$ = 1000 litres]
So, volume of tank = 1800000 litres
[1.5 marks]
Volume of water consumed by 1 person in 1 day = 150 litre.
Total volume of water consumed in a day by total population = 150 × 4000
[0.5 mark]
Required number of days $=\frac{Volumeoftank}{totalvolumeofwaterconsumedin1day}=\frac{1800000}{150\times 4000}=3days$
[1 mark]