Question 350621
Let {{{S}}} be the number of student tickets, {{{A}}} the number of adult tickets.
1.{{{S+A=300}}}
2.{{{3S+5A=1130}}}
Multiply eq. 1 by (-3) and add to eq. 2,
{{{-3S-3A+3S+5A=-900+1130}}}
{{{2A=230}}}
{{{A=115}}}
Then from eq. 1,
{{{115+S=300}}}
{{{highlight(S=185)}}}