The students participated in the tree planting activity. They planned to plant 355 trees, but 265 trees have already been planted. The rest will be planted by 9 students. How many trees are planted by each student on average?
同学们参加植树活动，计划植355棵，已经植了265棵，剩下的由9名同学来植，平均每个同学植树多少棵？
<gadget id="calculator">355 - 265</gadget>
<output>90</output>

<gadget id="calculator">90 / 9</gadget>
<output>10</output>

<result>10</result>