Question 750944
x is an adults ticket
y is a child's ticket

  x + y  = 95 .....1
12x + 9y = 960 ....2

Multiply (1) by 9

 9x + 9y = 855 ....3
12x + 9y = 960 ....2

Subtract 3 from 2

 3x      = 105
  x      = 35
Substitute x = 35 into (1)

 x + y = 95
35 + y = 95
     y = 95 - 35
     y = 60

 35*$12 + 60*$9 = $960

Hope this helps
:-)