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      Question

      Ravi has a 120-liter mixture containing 40% oil and the

      rest water. To reduce the concentration of oil in the mixture, he plans to add water. How much water does he need to add in order to reduce the oil percentage to 12%?
      A 320 litres Correct Answer Incorrect Answer
      B 240 litres Correct Answer Incorrect Answer
      C 280 litres Correct Answer Incorrect Answer
      D 360 litres Correct Answer Incorrect Answer

      Solution

      Present quantity of oil in the mixture = 120 X 0.4 = 48 litres Since, Ravi is adding only water, the quantity of oil will remain same in the mixture. So, new quantity of mixture = 48 ÷ 0.12 = 400 litres So, quantity of water to be added = 400 - 120 = 280 litres

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