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?
First, find how many leaves the roof can hold: 500 pounds * 1000 leaves/pound = 
<gadget id="calculator">500*1000</gadget>
<output>500_000</output>
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 = 
<gadget id="calculator">500000/100</gadget>
<output>5_000</output>
5000 days.

<result>5_000</result>