**A village, having a population of 4000, requires 150 litres of water per head per day. It has a tank measuring 20 m × 15 m × 6 m. For how many days will the water of this tank last?**

**Solution:**

Water requirement of 1 person per day **litres**

Water requirement of 4000 people per day **litres**

1000 litres =1

Therefore, 1 litre

600000 litres **(1)**

It means that 4000 people of village have 600 of water consumption in one day.

Length of cuboidal tank **m**

Breadth of cuboidal tank **m**

Height of cuboidal tank **m**

Volume of cuboidal tank ** (2)**

Dividing **(2)** by **(1)**, we get

Number of days water will last **days**