Answer:
Step-by-step explanation:
You want the number of tickets of each kind sold if 169 tickets were sold for $1795, and lower box tickets were $12.50 while upper box tickets were $10.
Let x represent the number of lower box tickets sold. Then 169 -x is the number of upper box tickets sold. The total revenue is ...
 12.50(x) + 10.00(169 -x) = 1795.00
Simplifying, we get
 2.50x +1690 = 1795
 2.5x = 105 . . . . . . . . . . . subtract 1690
 x = 42 . . . . . . . . . . . . divide by 2.5; the number of lower box ticket sold
 169 -42 = 127 . . . . . . the number of upper box tickets sold
42 lower box and 127 upper box tickets were purchased.