WBCS.LIVE practice question

How many litre of water is to be mixed in 12 litre of milk costing Rs. 10 per litre, so that it can be sold at Rs. 8 per litre?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 3 Litre
  2. 5 Litre
  3. 4 Litre
  4. 3.5 Litre

Correct answer and explanation

Correct answer: 3 Litre

Explanation: āœ… Correct Answer: A) 3 Litre šŸ“š Explanation: The total cost of 12 litres of milk at Rs. 10 per litre is Rs. 120. To sell the mixture at Rs. 8 per litre and still recover the same cost, we need a certain total volume. Dividing the total cost of Rs. 120 by the new price of Rs. 8 gives a total volume of 15 litres. Subtracting the original 12 litres of milk leaves 3 litres of water to be added.