It took Master Li 15 hours to process a batch of parts, with an average of 48 parts processed per hour. How many parts are there in this batch?
李师傅加工一批零件共用了15小时，平均每小时加工零件48个，这批零件有多少个？
<gadget id="calculator">48 * 15</gadget>
<output>720</output>

<result>720</result>