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    Question

    In a 120-litre chemical mixture, the chemicals A and B are

    in the ratio 5:7. How much of chemical A must be added to make the ratio 7:7 (i.e., equal amounts)?
    A 25 litres Correct Answer Incorrect Answer
    B 35 litres Correct Answer Incorrect Answer
    C 20 litres Correct Answer Incorrect Answer
    D 12 litres Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ,

    Quantity of A = (5/12) Ă— 120 = 50 litres

    Quantity of B = (7/12) Ă— 120 = 70 litres

    Let the amount of A to be added be x litres

    Then, (50 + x) : 70 = 7 : 7

    So, 50 + x = 70

    x = 70 - 50 = 20 litres

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