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    Question

    A lab technician has a 500-litre solution containing a mix

    of salt and water in a 9:11 ratio. If 40% of this solution is removed and replaced with an equal amount of water, what is the new ratio of salt to water in the final mixture?
    A 6:7 Correct Answer Incorrect Answer
    B 7:11 Correct Answer Incorrect Answer
    C 27:67 Correct Answer Incorrect Answer
    D 5:11 Correct Answer Incorrect Answer

    Solution

    ATQ;
    Quantity of salt in the solution = (9/20) × 500 = 225 litres
    Quantity of water in the solution = (500 – 225) = 275 litres
    Quantity of solution taken out = (0.4 × 500) = 200 litres
    New ratio = {225 – (225 × 0.4)} : {275 – (275 × 0.4) + 200}
    = 135 : 335
    = 27:67

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