Question 188065
Devon purchased tickets to an air show for 9 adults and 2 children. 
The total cost was 192 dollars. 
The cost of a child's ticket was 3 dollars less than the cost of an adult's ticket. 
Find the price of an adult's ticket and a child's ticket
:
Let x = cost of an adult ticket
then
(x-3) = cost of a child's ticket
;
9x + 2(x-3) = 192
:
9x + 2x - 6 = 192
11x = 192 + 6
11x = 198
x = {{{198/11}}}
x = $18 for an adult ticket
then
18 - 3 = $15 for a child's ticket
;
;
Check: 
9(18) + 2(15) = 192