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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 ‘3x’ and ‘11x’ 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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