Question 1203711
Adult quantity is half the children quantity or in other words, children quantity is twice the adult quantity.
<pre>
               PRICE         QTY          REVENUE
CHILDRN          5           2y           5*2y
STDNTS           7          367-3y        7(367-3y)
ADULTS          12            y           12y
Total                         367         2668
</pre>
The necessary equation is obvious.