You are making a tornado in each of 2 bottles. Each bottle needs to contain 20/4 cups of water. You only have a 1/4 cup measuring cup. How many times do you need to fill the measuring cup?
AAAaannndd the bot gets it wrong yet again!
clearly, 20/4 cups will need 20 times 1/4 cup.
so, 40 fills for the two bottles