A workshop produces a batch of parts, 80 parts per hour, and it takes 15 hours to complete. If it takes 12 hours to complete, how many parts must be produced per hour? (Solved with proportional knowledge)
某车间生产一批零件，每小时生产80个，需要15小时完成，如果要求12小时完成，每小时必须生产多少个零件？(用比例知识解决)
<gadget id="calculator">80 * 15</gadget>
<output>1_200</output>

<gadget id="calculator">1_200 / 12</gadget>
<output>100</output>

<result>100</result>