For a reception Robin needs 300 servings of punch at 8 fluid

-For a reception, Robin needs 300 servings of punch at 8 fluid ounces per serving. How many gallons does she need to prepare? (round your answer to a whole number)

Solution

From question we have :
1 serving requires 8 fluid ounces
So, 300 serving will require 8*300 fluid ounces i.e. 2400 fluid ounces.

We know,

1 fluid ounce = (1/128) gallon
   2400 fluid ounce = 2400*(1/128) gallons = 2400/128 gallons = 18.75 gallons ~ 19 gallons.

Answer - Robin needs to prepare 19 gallons .