You have 8 gallons of lemonade to sell. You use cone-shaped cups that are 9 centimeters in diameter and 12 centimeters tall. Each customer uses one paper cup. How many paper cups will you need if you sell all of the lemonade? (1 gal ≈ 3785 cm3)

about 268 cups

Step-by-step explanation:

Assuming every cup is filled up to the top, find the area of the cone using A = pi x radius^2 x height/3. using this i got about 113.097 cm^3. Using the given conversion factor, 8 gallons is 30,280 cm^3. Simply then divide the area by the gallons, and I got 267.735 which rounds to about 268 cups.

Hope this helps :)