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    Question

    720 ml of a mixture contains milk and water in the ratio

    5:4. If `x` ml of milk and `(x - 40)` ml of water are added, the new ratio becomes 7:6. Find the value of `x`.
    A 400 Correct Answer Incorrect Answer
    B 420 Correct Answer Incorrect Answer
    C 440 Correct Answer Incorrect Answer
    D 460 Correct Answer Incorrect Answer
    E 480 Correct Answer Incorrect Answer

    Solution

    Milk = (5/9) × 720 = 400 ml
    Water = (4/9) × 720 = 320 ml
    (400 + x)/(320 + x - 40) = 7/6
    6(400 + x) = 7(280 + x)
    2400 + 6x = 1960 + 7x
    x = 440

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