Multiple Choice Questions on A group of men decided to do a job in 4 days but 20 men dropped out everyday Find the number of men ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A group of men decided to do a job in 4 days but 20 men dropped out everyday Find the number of men ...........

Quant (SSC) Time and work
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    A group of men decided to do a job in 4 days, but 20 men dropped out everyday. Find the number of men who initially decided to do the job, if job was completed in 7 days?

    70

    Incorrect Answer

    110

    Incorrect Answer

    140

    Correct Answer

    120

    Incorrect Answer
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    Explanation:

    Let the initial number of men be m
    Total work = 4 m
    m + (m – 20) + (m – 40) + …… = 4 m
    7/2 [2m + 6 (–20)] = 4m
    7/2 (2m – 120) = 4m
    m =140

    By: Amit Kumar
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