A bucket contains 40 liters of milk priced at Rs. 3.50 per liter. How many liters of water should be added to reduce the price of milk to Rs. 2 per liter?

Explanation

The total cost of the milk is 40 × Rs. 3.50 = Rs. 140. After adding water, the price per liter becomes Rs. 2. Therefore, the new total volume = Rs. 140 ÷ Rs. 2 = 70 liters. The amount of water added = 70 - 40 = 30 liters.