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 mark]

Answer 1

volume of the tank = l×b×h
= 20 m × 15 m × 6 m
= 1800 m3 [∵ 1 m3= 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 $=\frac{Volumeof\tan k}{totalvolumeofwaterconsumedin1day}=\frac{1800000}{150\times 4000}=3days$
[1 mark]