Question 1175137
k, number which Kayla sells
2k-5, number which Austin sells



I am assuming you said,"cost" when you meant to say "price" of their magazines.
Austin's revenue, {{{18.2(2k-5)}}}
Kayla's revenue, {{{32.5k}}}


Total revenue both combined,  {{{18(2k-5)+32.5k=951.2}}};
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The question would seem to be asking for the value of {{{k+(2k-5)=3k-5}}}.