You can
put this solution on YOUR website!let x be the number of activity cardholder's tickets sold at $1.25
non - 284-x tickets $2.25
Total revene = $521
..
1,25x+(284-x)*2.25 = 521
1.25x + 639-2.25x=521
-x= -639-521
x= 118 activity cardholder's tickets
284-118= 166 non activity cardholder's tickets