Two workers process a batch of parts. Each worker can only process 25 pieces per hour. Xiao Wang worked for 12 hours and went to rest when he was tired. Worker Lin Shuang continued to work. After working for 7 hours, he just completed the task of this batch of parts. How many of these parts are there for you? ?
两个工人加工一批零件．每个工人每小时都只能加工25个，小王加工了12小时，累了休息去了，工人林双接着工作，工作7小时刚好完成了这批零件任务，这些零件给你个有多少个？
<gadget id="calculator">12 + 7</gadget>
<output>19</output>

<gadget id="calculator">25 * 19</gadget>
<output>475</output>

<result>475</result>