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    Question

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

    2:3. If `x` ml of milk and `(x + 80)` ml of water are added, the final ratio becomes 7:9. Find the value of `x`.
    A 458 Correct Answer Incorrect Answer
    B 468 Correct Answer Incorrect Answer
    C 478 Correct Answer Incorrect Answer
    D 488 Correct Answer Incorrect Answer
    E 498 Correct Answer Incorrect Answer

    Solution

    Milk = (2/5) × 660 = 264 ml
    Water = (3/5) × 660 = 396 ml
    (264 + x)/(396 + x + 80) = 7/9
    9(264 + x) = 7(476 + x)
    2376 + 9x = 3332 + 7x
    2x = 956
    ⇒ x = 478

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