Question

Solve the following.
A pond in a field holds 120000 litres of water. It costs 18000 rupees to make such a pond. How many ponds will be required to store 480000 litres of water, and what would be the expense?

Answer 1

Number of ponds required to store 120000 litres of water = 1

∴ Number of ponds required to store 1 litre of water = $\frac{1}{120000}$

⇒ Number of ponds required to store 480000 litres of water = $\frac{1}{120000}$ × 480000 = 4

Thus, 4 ponds required to store 480000 litres of water.

Now,

Cost of making 1 pond = ₹ 18,000

∴ Cost of making 4 ponds = ₹ 18,000 × 4 = ₹ 72,000

Thus, the expense to make 4 ponds to store 480000 litres of water is ₹ 72,000.