Question 165626
a= # of adults s= # of students  so 3a+2s=824  and a=2s  so substituting a in the second equation ,into the first equation we get 3(2s)+2s=824  so 8s=824

and s=103  so since a=2 times s(103) then a =206

answer:  206 adult tickets and 103 student tickets were sold.