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    Question

    Quantity of milk is 10% more than that of water in 210

    litres mixture. On adding (n - 5) litres water and (n + 5) litres milk, the new ratio becomes 11:10. Find the value of 'n'.
    A 95 Correct Answer Incorrect Answer
    B 100 Correct Answer Incorrect Answer
    C 105 Correct Answer Incorrect Answer
    D 110 Correct Answer Incorrect Answer
    E 115 Correct Answer Incorrect Answer

    Solution

    Let water = a, milk = 1.1a
    ⇒ 2.1a = 210 ⇒ a = 100, Water = 100, Milk = 110
    Now, (110 + n + 5):(100 + n - 5) = 11:10
    ⇒ (115 + n):(95 + n) = 11:10
    ⇒ 10(115 + n) = 11(95 + n)
    ⇒ 1150 + 10n = 1045 + 11n
    ⇒ n = 105

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