4 groups planted 48 trees, each group planted ((())/(())) of these numbers on average, how many trees were planted by each group on average.
4个小组植了48棵树，平均每个小组植了这些数的((())/(()))，平均每个小组植树多少棵．
<gadget id="calculator">48 / 4</gadget>
<output>12</output>

<result>12</result>