Question 1187030
Question is about how much IN SALES, or for the example, the revenue.
Simple Arithmetic.  



{{{system(p-3m=25,p+m=393)}}}
Try to use Elimination Method.


Martha,  $92
Priscilla, $301





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priscill's minus martha's was 25

and priscilla's plus martha's was 393.


If you want to start and use some simple algebra, then
{{{system(p-m=25,p+m=393)}}}
and you can easily use Elimination Method.