Plant cotton in a triangular field with a base of 80 meters and a height of 50 meters. If 10 plants are planted per square meter, how many cotton plants can be planted in this field?
在一块底为80米，高为50米的三角形地里种棉花，如果每平方米种10株，这块地可种棉花多少株？
<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">80 * 25 * 10</gadget>
<output>20_000</output>

<result>20_000</result>