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==section input Maria can do a certain job in *[input q=3] days and Mario can do the same job in *[input w=2] days. If they work together, in how many days will the work be finished? ==section solution NOTE: work done =work rate * time Here, Maria's work rate is *[assign e=1/$q] {{{1/$q=$e}}} while Mario's is *[assign r=1/$w] {{{1/$w=$r}}}. Now, the time is unknown so the time is x. Furthermore, the work done here is 1 because they are just doing a single job. So, {{{$e*x+$r*x=1}}} {{{x=1/($e+$r)}}} *[assign y=1/($e+$r)] {{{x=$y}}} Thus they can do the job in just $y days ==section output y ==section check hghh
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