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Grazes

  • 3 years ago

if it takes 12 people 8 hours to do a certain job, how many hours would it take 3 people to do 1/4 of the same job?

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  1. julianmiddleton
    • 3 years ago
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    8 hours

  2. cwrw238
    • 3 years ago
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    find how long it takes 3 people to do the whole job then divide that by 4

  3. Grazes
    • 3 years ago
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    @cwrw238 If Julian is correct, you would need to multiply by 4 instead of dividing.

  4. cwrw238
    • 3 years ago
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    for whole job time by 3 people = 12 * 8 ----- = 32 hours 3 - now divide that by 4...

  5. Grazes
    • 3 years ago
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    But why not 12/8=3/x as a proportion?

  6. cwrw238
    • 3 years ago
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    no - the number of hours for 3 people must take more time than when 12 people do it ( time 4)

  7. Grazes
    • 3 years ago
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    I see.

  8. cwrw238
    • 3 years ago
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    this is inverse proportionality less people - more hours

  9. cwrw238
    • 3 years ago
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    h = k/p when h = 8, p = 12 8 = k/12 k = 96 so h = 96/p when p = 3 h = 96/3 = 32

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