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    Question

    150 litres of a mixture (paint + oil) contains 20% oil.

    How much oil should be added to make the ratio of paint to oil 5:3?
    A 36 litres Correct Answer Incorrect Answer
    B 40 litres Correct Answer Incorrect Answer
    C 42 litres Correct Answer Incorrect Answer
    D 48 litres Correct Answer Incorrect Answer

    Solution

    Let the quantity of oil to be mixed be тАШxтАЩ litres
    According to the question,
    (0.80 ├Ч 150)/(0.20 ├Ч 150 + x) = 5/3
    120/(30 + x) = 5/3
    Or, 5(30 + x) = 360
    Or, 150 + 5x = 360
    Or, 5x = 210 тЗТ x = 42
    Therefore, quantity of oil to be mixed = 42 litres

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