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Repeated withdraw-and-replace: quantity or percent after n operations

This type of question, asked 2 times: 8 Aug 2022 Tier II, 2 Mar 2023 Tier II. All 2 questions below, oldest first.

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  1. Question 1

    8 Aug 2022 Tier II

    14
    The ratio of milk to water in a 100 litres mixture is 2 : 3. 10 litres of this mixture is withdrawn and replaced with milk. This process is repeated 2 more times. What is the percentage of milk in final mixture?

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  2. Question 2

    2 Mar 2023 Tier II

    24
    40 litres of milk are kept in a container. 4 litres of milk were removed from this container and replaced with water. This procedure was performed two more times. How much milk does the container now hold?

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