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    Question

    A certain mixture consists of oil and water, with the

    water content exceeding that of oil by 20%. When 70 ml of oil and 60 ml of water are introduced into the mixture, the ratio of oil to water in the new mixture becomes 11:12. Can you determine the original quantity of water in the mixture?
    A 200 ml Correct Answer Incorrect Answer
    B 185 ml Correct Answer Incorrect Answer
    C 150 ml Correct Answer Incorrect Answer
    D 180 ml Correct Answer Incorrect Answer
    E 250 ml Correct Answer Incorrect Answer

    Solution

    We can say that let initial quantity of oil in the mixture be ‘a’ ml Initial quantity of water in the mixture = 1.2 × a = 1.2a ml According to question, (a + 70)/(1.2a + 60) = 11/12 12a + 840 = 13.2a + 660 1.2a = 180 a = 150 Initial quantity of water in the mixture = 1.2 × 150 = 180 ml

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