anonymous
  • anonymous
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?
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
8 hours
cwrw238
  • cwrw238
find how long it takes 3 people to do the whole job then divide that by 4
anonymous
  • anonymous
@cwrw238 If Julian is correct, you would need to multiply by 4 instead of dividing.

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cwrw238
  • cwrw238
for whole job time by 3 people = 12 * 8 ----- = 32 hours 3 - now divide that by 4...
anonymous
  • anonymous
But why not 12/8=3/x as a proportion?
cwrw238
  • cwrw238
no - the number of hours for 3 people must take more time than when 12 people do it ( time 4)
anonymous
  • anonymous
I see.
cwrw238
  • cwrw238
this is inverse proportionality less people - more hours
cwrw238
  • cwrw238
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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