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Part of a mixture replaced with water twice: final ratio or percentage

The same question, asked 2 times: 15 Sep 2025 S1*, 26 Sep 2025 S1. Every wording below, oldest first.

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  1. Question 1

    15 Sep 2025 S1

    63
    A cistern contains 100 liters of pure syrup. 10 liters of syrup are drawn out and replaced by water. Then, 10 liters of the mixture are drawn out and replaced by water again. What is the ratio of syrup to water in the final mixture?

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  2. Question 2

    26 Sep 2025 S1

    61
    A container has 60 litres of a mixture of acid and water in the ratio 7:3. 20%20\% of the mixture is taken out and replaced with water. This operation is repeated once more. What is the final percentage of acid in the mixture?

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