Master Wang needs to make 20 parts, from 10:00 am to 1:00 pm, there are still 5 parts left to be made, how many parts does Master Wang make per hour?
王师傅要做20个零件，从上午10：00做到下午1：00，还剩5个零件没有做，王师傅每小时做几个零件？
<gadget id="calculator">20 - 5</gadget>
<output>15</output>

<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<result>5</result>