The students want to plant 85 trees, 15 of which have already been planted, and the remaining saplings are distributed to 7 groups on average. How many trees do each group need to plant?
同学们要植85棵树，已经植了15棵，剩下的树苗平均分给7个小组，每个小组还要植多少棵树？
<gadget id="calculator">85 - 15</gadget>
<output>70</output>

<gadget id="calculator">70 / 7</gadget>
<output>10</output>

<result>10</result>