To answer this, you will write and equation in terms of the number of adult tickets sold and then solve for a, the number of adult tickets.
$5a + $3.50s = $2517.50 $5a + $3.50(a + 100) = $2517.50 5a + 3.50a + 350 = 2517.50 8.50a -350 -350 <u>8.5a</u> = <u>2167.50</u> 8.5 8.5 a = 255 The number of adult tickets sold was 255, and the number of student tickets sold was 355 (255 +100).