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    Question

    Quantity of milk is 20% more than that of water in 220

    litres mixture (milk + water). On adding (n - 6) litres water and (n + 6) litres milk in mixture, ratio of milk to water becomes 7:6. Find the value of 'n'.
    A 94 Correct Answer Incorrect Answer
    B 96 Correct Answer Incorrect Answer
    C 98 Correct Answer Incorrect Answer
    D 100 Correct Answer Incorrect Answer

    Solution

    Let water = a
    Milk = 1.2a
    So, a + 1.2a = 2.2a = 220
    тЗТ a = 100
    Water = 100 litres, Milk = 120 litres
    Now, (120 + n + 6):(100 + n - 6) = 7:6
    тЗТ (126 + n):(94 + n) = 7:6
    тЗТ 6(126 + n) = 7(94 + n)
    тЗТ 756 + 6n = 658 + 7n
    тЗТ n = 98

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