The gross mass and the independent compartment limit

A fictional shipment exercise lists twelve packages with a stated gross mass of twenty kilograms each and an additional forty kilograms of equipment. The model says all these masses count toward the relevant total. A particular compartment has its own fifty-kilogram limit, and a proposed seventy-kilogram item would be placed there even though the vehicle has spare overall capacity. A learner subtracts packaging tare a second time and argues that the unused total margin must also increase the compartment rating. The exercise supplies no alternative approval or revised restraint plan. These are explicit hypothetical values, not Chinese statutory package or vehicle limits. The task is to apply the definitions consistently and separate an arithmetic total from an independent component condition.