Answer :
Answer:
80 tickets
Step-by-step explanation:
Adult tickets = A (cost $8)
student tickets = S (cost $4)
A = S + 20 (20 more adult tickets than student tickets)
Total amount = $880
$8A + $4S = 880
New equation:
$8(S+20) + $4S = 880
$8S + 160 + $4S = 880
$12S = 720
S = 60
Next we find the adult tickets by substituting back:
A = S + 20
A = 60 + 20
A = 80