Question 1207697
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I think the easiest way is to use the fact that 

{{{matrix(1,3,WORKERS,""*"",TIME)/JOBS)}}} is always a constant.   

{{{(3*4)/2}}}{{{""=""}}}{{{6}}}, so 6 is the constant.

So put x for the unknown, in this case the number of workers, 
and set it equal to the constant 6

{{{(x*6)/12}}}{{{""=""}}}{{{6}}}

{{{6x}}}{{{""=""}}}{{{72}}}

{{{x}}}{{{""=""}}}{{{12}}}

Edwin</pre>