Final answer:
Without the total capacity of the fish tank, we cannot provide the exact amount of water needed to fill it. To solve problems like this, subtract the amount of water in the tank from its total capacity. Remember to use the correct conversion factor if the units are different.
Step-by-step explanation:
To determine how much more water is needed to completely fill the fish tank after adding 16 quarts of water, we need additional details about the total capacity of the fish tank, which is not provided in the question. Without this information, we cannot calculate the exact amount of water required to fill the tank.
However, we can explain how to approach the problem assuming we knew the tank's total capacity. Let's say, for example, the tank's total capacity was 24 quarts. Since the tank already has 16 quarts of water, you would subtract the current amount from the total capacity to find out how much more is needed. So, 24 quarts (total capacity) - 16 quarts (current amount) = 8 quarts needed to fill the tank, which corresponds to option b).
Remember, for unit conversions, you would multiply when converting from a larger unit to a smaller unit, such as gallons to quarts, at a conversion rate of 4 quarts per 1 gallon.