7. (6 points) 28 containers of the same size need to be transported to the dock, with each container weighing 1560 kilograms. A truck with a load capacity of 6 tons is arranged to transport these containers, and the truck's cargo area can accommodate a maximum of 5 containers. Therefore, the truck needs to make at least $\qquad$ trips.
【Solution】Solution: 6 tons $=6000$ kilograms $6000 \div 1560=3$ (units) $\cdots 1320$ kilograms, that is, one truck can transport at most 3 containers at a time. $28 \div 3=9$ (trips) $\cdots 1$ unit. That is, it needs to make $9+1=10$ (trips). Therefore, the answer is 10.