Holly loves to drink chocolate milk. With breakfast, she drinks 8 ounces of chocolate milk before leaving for work. During her lunch break, she buys a new 64-ounce container of chocolate milk and then drinks 8 ounces of it. With dinner, she drinks another 8 ounces of chocolate milk. If she ends the day with 56 ounces of chocolate milk, how many ounces of chocolate milk did she begin the day with? Let's think first. Chain of thought:
Before dinner, she had 56 + 8 = 64 ounces of CM. Before drinking 8 ounces of CM during lunch, she had 64 + 8 = 72 ounces of CM. Before buying 64 ounces of CM, she had 72 - 64 = 8 ounces of CM. And before breakfast, she had 8 + 8 = 16 ounces of chocolate milk.
Therefore, the answer is 16.