Uncle Wang worked from 7:50 am to 11:50 noon, and made a total of 36 parts. How many parts does he make on average per hour?
王叔叔从上午7：50工作到中午11：50，一共做了36个零件，他平均每小时做多少个零件？
<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<result>9</result>