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M1 D1 / W1 = M2 D2 / W2: one unknown

This type of question, asked 5 times: 19 Jul 2023 S4, 27 Jul 2023 S3, 22 Sep 2025 S1, 22 Sep 2025 S3, 26 Sep 2025 S2. All 6 questions 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

    27 Jul 2023 S3

    62
    40 men can complete a work in 30 days. However, if 10 men leave the group, how many days will the group take to complete the work?

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  3. Question 3

    22 Sep 2025 S1

    62
    35 men can do a piece of work in 8 days. Find the time required by 16 men to do four times the work.

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  4. Question 4

    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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  5. Question 5

    22 Sep 2025 S3

    64
    2020 men can do a piece of work in 4545 days. Find the percentage amount of work done by 6060 men in 66 days.

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  6. Question 6

    26 Sep 2025 S2

    67
    66 women can do a piece of work in 79 days. Find the number of days required by 6 women to complete 1 / 11th of the work.

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