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Grazes

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?

  • one year ago
  • one year ago

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  1. julianmiddleton
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    8 hours

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

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

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

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

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

    • one year ago
  7. Grazes
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    I see.

    • one year ago
  8. cwrw238
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    this is inverse proportionality less people - more hours

    • one year ago
  9. cwrw238
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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

    • one year ago
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