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Two work together for some days, then a third finishes the rest: third's time alone

This type of question, asked 2 times: 21 Jul 2023 S3, 26 Sep 2025 S3. All 3 questions below, oldest first.

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  1. Question 1

    21 Jul 2023 S3

    63
    A can do 20% of a work in 4 days, and B can do 3313%33\frac{1}{3}\% of the same work in 10 days. They worked together for 9 days and then C completed the remaining work in 6 days. B and C together will complete 75% of the same work in:

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  2. Question 2

    26 Sep 2025 S3

    61
    Lalit can finish a work in 15 days. Laxman can finish the same work in 25 days. They work together for 5 days. If the rest of the work is finished by Lalit and Deven in 4 days, then in how many days can Deven alone finish the work?

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  3. Question 3

    26 Sep 2025 S3

    75
    A can complete a task in 30 days, and B can complete the same task in 40 days. They work together for 10 days, and then C joins them and completes the remaining work in 5 days. How long will C alone take to complete the task?

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