Consider the question. Marly is making soup. He adds 2 quarts of milk and three times as much chicken stock to 1 quart of pureed vegetables. Then he divides the soup into bags that can hold 3 quarts each. How many bags does he need?
 If the answer is '3'; explain the reasoning:
First triple the amount of milk to find the amount of chicken stock: 2 quarts * 3 = 6 quarts. Then add all three quantities to find the total volume of the soup: 6 quarts + 2 quarts + 1 quart = 9 quarts. Finally, divide the number of quarts by the number of quarts per bag to find the number of bags needed: 9 quarts / 3 quarts / bag = 3 bags.