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"If 3 people can do a job in 5 days, how many days will be needed if 4 people do the same job?"

  • Algebra -

    if it took 3 people 1 day, each person would be doing 1/3 job/day

    It takes 5 days, so a person does 1/15 job/day

    4 people can therefore do 4/15 job/day

    a whole job will therefore take 15/4 days

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