How may gallons of punch do you needs to serve 90 people?

Answer 1

How much per person? Let's say 8 ounces, i.e., half-pint.

8*90 = 720 ounces

16 ounces = 1 pint.

32 = 1 quart

128 ounces = 1 gallon.

You need 720/128 = 5.625 gallons but that's a small serving.

Better make 10!