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    Question

    A mixture (acetone and water) contains 30% acetone and

    rest 70 litres water. How much acetone should be added to the mixture to make the ratio of acetone to water in the mixture 5:2?
    A 160 litres Correct Answer Incorrect Answer
    B 100 litres Correct Answer Incorrect Answer
    C 145 litres Correct Answer Incorrect Answer
    D 130 litres Correct Answer Incorrect Answer
    E 185 litres Correct Answer Incorrect Answer

    Solution

    Initial quantity of acetone in the mixture = 70 × (0.30/0.70) = 30 litres
    Let the quantity of acetone added be ‘x’ litres
    According to the question,
    (30 + x)/70 = 5/2
    => x = 175 – 30 = 145
    Therefore, quantity of acetone added = 145 litres

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