The perimeter of a square vegetable garden is 320 meters, and a total of 19.2 tons of vegetables are harvested in one season. On average, how many tons of vegetables are harvested in one hectare.
一个正方形菜园的周长是320米，一季共收青菜19.2吨，平均每公顷一季收青菜多少吨．
<gadget id="calculator">320 / 4</gadget>
<output>80</output>

<gadget id="calculator">320 / 4 / 10_000</gadget>
<output>1/125 = around 0.008</output>

<gadget id="calculator">80 * (1/125)</gadget>
<output>16/25 = around 0.64</output>

<gadget id="calculator">19.2 / (16/25)</gadget>
<output>30</output>

<result>30</result>