The master and apprentice completed a total of 465 parts in 15 days. The master makes 18 pieces every day, how many more pieces does the master complete than the apprentice every day?
师徒两人在15天中共完成465个零件．师傅每天制造18个，师傅每天完成的件数比徒弟多多少个？
<gadget id="calculator">465 / 15</gadget>
<output>31</output>

<gadget id="calculator">31 - 18</gadget>
<output>13</output>

<gadget id="calculator">18 - 13</gadget>
<output>5</output>

<result>5</result>