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Mathematics 8 Online
OpenStudy (anonymous):

if it takes two people 60 hours to build a fence, how long will it take three people to do the same job?

OpenStudy (anonymous):

40?

OpenStudy (anonymous):

how did you determine 40

OpenStudy (anonymous):

It takes less time for 3 people than 2

OpenStudy (anonymous):

20?

OpenStudy (anonymous):

i understand that but why not 30 or 20 hours

OpenStudy (anonymous):

20

OpenStudy (grace111):

maybe 30

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