groups plant 20 trees, the average number of trees planted by each group is ((())/(())), how many trees are planted in each group.
4个小组种20棵树，平均每个小组种这些树的((())/(()))，每组种了多少棵．
<gadget id="calculator">20 / 4</gadget>
<output>5</output>

<result>5</result>