Final answer:
To calculate the grams of fat in 1 L of milk, we need the specific fat content percentage, which is not provided. Therefore, we cannot answer the question based solely on the density of the milk.
Step-by-step explanation:
The question relates to calculating the quantity of fat content in 1 L of brand A milk based on its density. Density is the mass of a substance divided by its volume. Unfortunately, the question does not provide the specific percentage of fat in the milk; thus, we cannot calculate the grams of fat solely based on density. Normally, fat content in milk is given as a percentage of mass, and without this information or the assumption of a typical fat content for a certain type of milk (e.g., whole, 2%, skim), we cannot determine the amount of fat in grams.