A square orchard has a perimeter of 1200 meters and a total of 3780 fruit trees are planted. How many fruit trees are planted per hectare?
一个正方形果园，周长是1200米，共种果树3780棵，那么平均每公顷种果树多少棵？
<gadget id="calculator">1_200 / 4</gadget>
<output>300</output>

<gadget id="calculator">1_200 / 4 / 10_000</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">300 * (3/100)</gadget>
<output>9</output>

<gadget id="calculator">3_780 / 9</gadget>
<output>420</output>

<result>420</result>