A car transported raw materials to the factory, 4 times in the morning, a total of 16 tons, and 5 times in the afternoon, 4 tons more than in the morning, how many tons on average each time?
一辆汽车给工厂运原料，上午运了4次，共运16吨，下午运了5次，比上午多运4吨，平均每次运多少吨？
<gadget id="calculator">16 + 4 + 16</gadget>
<output>36</output>

<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">36 / 9</gadget>
<output>4</output>

<result>4</result>