Question 1170986
p bags of popcorn
c boxes of candy
{{{system(p+c=175,5p+2.5c=687.5)}}}



To solve, try multiplying the revenue equation by  {{{1/2.5}}} to show {{{2p+c=275}}}.  You can use the system  {{{system(p+c=175,2p+c=275)}}}   to eliminate c,...