Question 1181309
a, price of adult
s, price of student
{{{system(4a+20s=82,6a+22s=99)}}}


System same as 
{{{system(2a+10s=41,6a+22s=99)}}}


Multiply first equation by 3:
{{{system(6a+30s=123,6a+22s=99)}}}


{{{E1-E2}}}:
{{{8s=24}}}
{{{highlight(s=3)}}}----------student price...