Answer:
67 tickets
Explanation:
Rollercoaster = 23 tickets
Bumper car = 28 tickets
Merry Go Round = 32 tickets
In, total she needs:
23 + 28 + 32 = 83 tickets
Now, Sandy had 21 and LOST 5, so now she has:
21 - 5 = 16 tickets
She would need MORE:
83 - 16 = 67 tickets