Question

How do you find how many cups are in a gallon

Answer 1

First we need to find the volume of water that can be filled in water 
   Then we will use the equation that
                  1 gallon = 3.8 lires
Then by using this we will calculate the amount of cup used by equalizing with litres and then by gallons and then calculate number of cups in gallons

Answer 2

Do an experiment to test out if the Capacity Table is true.
Or use mathematics, 1 gallon is 16 cups. To find it use from the smallest capacity to gallons.