Question 322345
Let A be the number of adult tickets, S students tickets.
1.{{{3A+2S=824}}}
2.{{{A=2S}}}
Substitute eq. 2 into eq. 1,
{{{3(2S)+2S=824}}}
{{{6S+2S=824}}}
{{{8S=824}}}
{{{S=103}}}tickets
Then from eq. 2,
{{{A=2(103)=206}}}tickets