Question 88343
Lets begin by assigning a variable to one of the ticket values.
x = number of adult tickets sold
Since there were a total of 130 tickets sold, the amount of children's tickets sold can be expressed as (130-x)

Now you can set up your equation
12x+8(130-x) = 1160
12x+1040-8x = 1160
4x+1040 = 1160
4x+1040-1040 = 1160-1040
4x = 120
x = 30

So, 30 adult tickets were sold and 100 children's tickets were sold

Good luck!