Question 1192958
<pre>
                TIME per switch                COST per swith             QUANTITY                                   

type A          4 minutes               3 dollars                          A

type B          6 minutes               6 dollars                          B

TOTALS         37 hours               2040 dollars
</pre>

{{{37*hours*60*(minutes/hour)=2220*minutes}}}


{{{system(4A+6B=2220,3A+6B=2040)}}}


These should give  {{{system(highlight(A=180),and,highlight(B=250))}}}