14. Now there are 4 containers weighing 3 tons each, 5 containers weighing 2.5 tons each, 14 containers weighing 1.5 tons each, and 7 containers weighing 1 ton each. How many trucks with a load capacity of 4.5 tons are needed at minimum to transport all the containers in one trip?
14. Now there are 4 containers weighing 3 tons each, 5 containers weighing 2.5 tons each, 14 containers weighing 1.5 tons each, and 7 containers weighing 1 ton each. How many trucks with a load capacity of 4.5 tons are needed to transport all the containers in one trip?
【Solution】Solution: The loading situation is as follows: $4+2+3+1+2=12$ (trucks);

Answer: Therefore, at least 12 trucks with a load capacity of 4.5 tons are needed to transport all the containers in one trip.