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n persons build it in d days: time for m persons

The same question, asked 2 times: 19 Jul 2023 S4*, 22 Sep 2025 S3. Every wording below, oldest first.

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  1. Question 1

    19 Jul 2023 S4

    54
    14 persons can build a house in 60 days. How long will it take 30 persons to build the same house, provided that they all work at the same rate?

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  2. Question 2

    22 Sep 2025 S3

    63
    If 1515 boys can build a house in 2020 days, in how many days can 2020 boys complete the same work.

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