Bill's roof can bear 500 pounds of weight. If 100 leaves fall on his roof every day, and 1000 leaves weighs 1 pound, how many days will it take for his roof to collapse? Let's be accurate as possible.
First, find how many leaves the roof can hold: 500 pounds * 1000 leaves / pound = 500000 leaves. Then divide that by the number of leaves that fall each day to find how many days before the roof collapses: 500000 leaves / 100 leaves / day = 5000 days.
The answer: 5000.