Question 25051
5 tickets =x
6 tickets = 16+2x


6(16+2x)+5x=1643
96+12x+5x=1643
96+17x=1643
17x=1547
x=91


16+2(91)=198


Hence, for $5 about 91 tickets were sold, and for $6 about 198 tickets were sold.
Paul.