Jay is making snowballs to prepare for a snowball fight with his sister. He can build 20 snowballs in an hour, but 2 melt every 15 minutes. How long will it take before he has 60 snowballs?
Every hour, Jay makes 20 snowballs.
At the same time, each hour 2 * 60/15 = 
<gadget id="calculator">2*60/15</gadget>
<output>8</output>
8 snowballs melt.
This means that each hour, Jay ends up with 20 - 8 = 
<gadget id="calculator">20-8</gadget>
<output>12</output>
12 more snowballs.
It will take Jay 60 / 12 = 
<gadget id="calculator">60/12</gadget>
<output>5</output>
5 hours to create enough snowballs.

<result>5</result>