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      Question

      A solution contains acid and water in the ratio of 3:11.

      If 10 litres of acid is added to the solution, the ratio of acid to water becomes 1:2. What was the initial amount of acid in the solution?
      A 12 litres Correct Answer Incorrect Answer
      B 18 litres Correct Answer Incorrect Answer
      C 10 litres Correct Answer Incorrect Answer
      D 21 litres Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      Let the initial quantity of acid and water be โ€˜3xโ€™ and โ€˜11xโ€™ litres, respectively. So, (3x + 10)/11x = 1/2 6x + 20 = 11x 5x = 20, x = 4 So, the initial amount of acid = 3x = 12 litres

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