Question 1205910
r, the work rate for 1 person


If one job is "build a garage", the description is  {{{(3r)(4)=1}}}.

This means, {{{r=1/12}}} or one person needs 12 days to build a garage.



How much time for 4 people?
{{{(4(1/12))x=1}}}

{{{x=3}}}-----three days



How many workers to do the job in 2 days?
n workers
{{{n(1/12)*2=1}}}


{{{(n)(1/6)=1}}}


{{{n=6}}}