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    Question

    A tank contains petrol and diesel in the ratio 9:5. If

    10% of the mixture is removed and replaced with diesel, what is the new ratio of petrol to diesel?
    A 15:11 Correct Answer Incorrect Answer
    B 11:17 Correct Answer Incorrect Answer
    C 15:13 Correct Answer Incorrect Answer
    D 17:10 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Total quantity = 14x litres Petrol = 14x × (9/14) = 9x litres Petrol left = 9x × 0.9 = 8.1x litres Diesel = 14x - 8.1x = 5.9x litres Required ratio = 8.1x : 5.9x = 81 : 59

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