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    Question

    A 400 ml mixture consists of 30% alcohol. Find how much

    alcohol must be added so that alcohol makes up 50% of the new mixture.
    A 172 ml Correct Answer Incorrect Answer
    B 122 ml Correct Answer Incorrect Answer
    C 160 ml Correct Answer Incorrect Answer
    D 127 ml Correct Answer Incorrect Answer

    Solution

    ATQ,

    Alcohol in the current mixture = 0.30 × 400 = 120 ml

    Let added alcohol be ‘x’ ml

    So, 120 + x = 0.50 × (400 + x)

    Or, 120 + x = 200 + 0.50x

    Or, 0.50x = 80

    So, x = 80 / 0.50 = 160 ml

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