Master Li and Master Zhao jointly make a batch of parts. Master Li makes 80 parts per hour, and Master Zhao makes 65 parts per hour. When it is finished, Master Li makes 60 more parts than Master Zhao. How many parts are in this batch?
李师傅和赵师傅合做一批零件，李师傅每小时做80个，赵师傅每小时做65个，完成时，李师傅比赵师傅多做了60个．这批零件共多少个？
<gadget id="calculator">80 - 65</gadget>
<output>15</output>

<gadget id="calculator">60 / 15</gadget>
<output>4</output>

<gadget id="calculator">80 + 65</gadget>
<output>145</output>

<gadget id="calculator">4 * 145</gadget>
<output>580</output>

<result>580</result>