Question 219517
Worst Case (ie heaviest load): He leaves with 6 bags (the most he carries) that are 7 pounds each (the heaviest they get). How much do they weigh total? They weigh {{{6*7=42}}} pounds total.



Now compare this to the best case...


Best Case (lightest load possible): He leaves with 4 bags (the smallest amount he carries) weighing 1 pound each (the lightest they get). In total, they weigh 4*1=4 pounds.



The difference between the heaviest and the lightest is then: 42-4=38



So the difference between Lyle’s heaviest possible grocery purchase and his lightest possible grocery purchase is 38 pounds.