There is a rectangular flowerbed with a length of 400 meters and a width of 250 meters. If 45,000 roses can be planted, how many roses can be planted per hectare?
有一块长400米、宽250米的长方形花圃，如果能栽45000棵玫瑰花，平均每公顷可种玫瑰花多少棵？
<gadget id="calculator">250 / 10_000</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">400 * (1/40)</gadget>
<output>10</output>

<gadget id="calculator">45_000 / 10</gadget>
<output>4_500</output>

<result>4_500</result>