The students in the fourth and fifth grades of the school had to water 620 trees, and the fifth grade students watered 50 trees every day for 8 days; the rest were watered by the fourth grade students in 5 days.
学校四、五年级的同学要给620棵树浇水，五年级同学每天浇50棵，浇了8天；剩下的由四年级同学来浇，5天浇完，平均每天浇多少棵？
<gadget id="calculator">50 * 8</gadget>
<output>400</output>

<gadget id="calculator">620 - 400</gadget>
<output>220</output>

<gadget id="calculator">220 / 5</gadget>
<output>44</output>

<result>44</result>