Plant trees in a rectangular field with a length of 20 meters and a width of 15 meters. Each tree occupies an area of 6 square meters. How many trees can be planted in this field?
在一块长20米，宽15米的长方形地里种树，每棵树占地6平方米，这块地能种多少棵树？
<gadget id="calculator">20 * 15</gadget>
<output>300</output>

<gadget id="calculator">300 / 6</gadget>
<output>50</output>

<result>50</result>