A parallelogram flowerbed with a base of 25 meters and a height of 20 meters has 4000 flowers in total. How many plants are planted per square meter on average?
一个平行四边形花圃，底是25米，高是20米，共栽了4000株花．平均每平方米栽花多少株？
<gadget id="calculator">25 * 20</gadget>
<output>500</output>

<gadget id="calculator">4_000 / 500</gadget>
<output>8</output>

<result>8</result>