Xiaodong's mother pastes 120 cement bags from 8 am to 12 noon. How many cement bags does she paste per hour on average?
小东妈妈从上午8时到中午12时共糊了120个水泥袋，她平均每小时糊了多少个水泥袋？
<gadget id="calculator">120 / 4</gadget>
<output>30</output>

<result>30</result>