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Now let's consider a truckload of packages of two types: light-weight packages weighing 20 lbs and heavy packages weighing 30 lbs. Suppose that the truck must carry 100 of the 30-lb packages in this load, and the rest of the load capacity of 7000 lb is to be filled with 20-lb packages. Let L be the number of 20-lb and H be the number of 30-lb packages. We need to determine how many of the 20-lb packages can be carried.