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    Question

    Quantity of water in a 420 litres mixture (alcohol +

    water) is 30 litres less than the quantity of alcohol in it. Find the quantity of water to be mixed so that the quantity of alcohol in the mixture becomes 45% of the whole mixture.
    A 60 litres Correct Answer Incorrect Answer
    B 20 litres Correct Answer Incorrect Answer
    C 40 litres Correct Answer Incorrect Answer
    D 80 litres Correct Answer Incorrect Answer

    Solution

    Quantity of water in the mixture = (420 тАУ 30)/2 = 195 litres So, Quantity of alcohol in the mixture = (420 тАУ 195) = 225 litres Total quantity of the mixture = 225 x (100/45) = 500 litres Therefore, quantity of water to be mixed = 500 тАУ 420 = 80 litres

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