8.1. In a batch, there are 90000 boxes of vaccine weighing 3300 grams each, and 5000 small boxes weighing 200 grams each. What is the minimum number of temperature-controlled containers needed if, according to the new rules, no more than 100 kilograms can be placed in each?
Answer: 3000

Solution. Note that no more than 30 boxes of vaccines can be placed in one container. Thus, less than $90000 / 30=3000$ containers would not be enough. Also, note that if a container holds 30 boxes, there is still room for 5 small boxes, so all these small boxes will fit into the free spaces.