To calculate the remaining fluid ounces of orange juice, we need to determine the total number of fluid ounces in 3 cups.
Given that 1 cup is equivalent to 8 fluid ounces, we can multiply the number of cups by 8 to find the total fluid ounces:
3 cups * 8 fluid ounces/cup = 24 fluid ounces
So, initially, there were 24 fluid ounces of orange juice.
Since Cody drank 20 fluid ounces, we subtract that amount from the total to find the remaining fluid ounces:
24 fluid ounces - 20 fluid ounces = 4 fluid ounces
Therefore, 4 fluid ounces of orange juice remain.