Answer:
900 Fluid Ounces
Explanation:
First add the number of people drinking the ounces. That would be adding the number of teachers and students.
40 + 94 = 134
It would 134 people.
Then multiply the number of people with the number of ounces in order to find an estimate of how much fluid ounces would be needed.

Since it's an estimate, we can round to the nearest hundred to make sure there is enough.
(approximately)
The answer would be 900 fluid ounces.