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    Question

    Sea water contains 5% salt by weight. If you have 40 kg

    of sea water, how much fresh water must be added to dilute the solution so that the salt concentration decreases to 2%?
    A 60 kg Correct Answer Incorrect Answer
    B 50 kg Correct Answer Incorrect Answer
    C 40 kg Correct Answer Incorrect Answer
    D 30 kg Correct Answer Incorrect Answer
    E 20 kg Correct Answer Incorrect Answer

    Solution

    There is 5% of salt in 40 kg of sea water
    So, amount of salt in 40 kg of sea water is = 5/100 * 40 = 2 kg
    Let the amount of fresh water need to be added be x kg
    2kg/(40+x)kg = 2% = 2/100
    100 = 40 + x
    X = 60kg

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