Three groups planted 36 trees. On average, each group planted ((())/(())) of these trees. How many trees did each group plant.
3个小组种36棵树，平均每个小组种了这些树的((())/(()))，每小组种了多少棵．
<gadget id="calculator">3 / 1</gadget>
<output>3</output>

<gadget id="calculator">36 / 3</gadget>
<output>12</output>

<result>12</result>