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    Question

    The ratio of milk to water is 1:2. When 1 litre of milk and

    1 litre of water are added, the new ratio becomes 2:3. Find the initial quantity of the mixture.
    A 7 litres Correct Answer Incorrect Answer
    B 2 litres Correct Answer Incorrect Answer
    C 3 litres Correct Answer Incorrect Answer
    D 8 litres Correct Answer Incorrect Answer
    E 9 litres Correct Answer Incorrect Answer

    Solution

    Let the initial quantity of milk and water be 'y' and '2y' litres respectively.
    So, (y + 1):(2y + 1) = 2:3
    Or, 3 × (y + 1) = 2 × (2y + 1)
    Or, 3y + 3 = 4y + 2
    Or, y = 1
    Therefore, required quantity = 3y = 3 × 1 = 3 litres

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