The city ordinance reads, Sanitation workers will not collect garbage in containers weighing more than fifty pounds. Workers are expected to use their best judgment in determining when a container weighs more than fifty pounds. If a container is too heavy, workers should attach one of the pre-printed warning messages (which are carried in all trucks) to the container, informing the household that the container weighs more than fifty pounds and cannot be collected. According to the passage, in order to determine if a container is too heavy, sanitation workers should