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    Question

    "In a mixture containing a total of 210 liters, the

    ratio of petrol to diesel is initially 3:2. A quantity 'p' liters of petrol and 1.5p liters of diesel are introduced into the mixture in such a way that the resulting mixture has a petrol-to-diesel ratio of 5:4. What is the combined quantity of petrol and diesel added to the mixture?"
    A 45 liters Correct Answer Incorrect Answer
    B 55 liters Correct Answer Incorrect Answer
    C 60 liters Correct Answer Incorrect Answer
    D 50 liters Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    ATQ, Quantity of petrol in the mixture initially = 210 ร— (3/5) = 126 liters Quantity of diesel in the mixture initially = 210 ร— (2/5) = 84 liters According to the question, (126 + p):(84 + 1.5p) = 5:4 504 + 4p = 7.5p + 420 84 = 3.5p p = 24 Quantity of petrol that is added = 24 liters Quantity of diesel that is added = 36 liters Hence Required quantity = 24 + 36 = 60 liters

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