Question 256749
A-adult tickets
S-student tickets
1.{{{A+S=1500}}}
2.{{{12A+6S=15600}}}
From 1,
{{{A=1500-S}}}
Substitute into eq. 2,
{{{12A+6S=15600}}}
{{{12(1500-S)+6S=15600}}}
{{{18000-12S+6S=15600}}}
{{{-6S=-2400}}}
{{{S=400}}}
Then from eq. 1,
{{{A=1500-S}}}
{{{A=1500-400}}}
{{{A=1100}}}