What is the area of a square wheat field whose side length is 500 meters?
一块边长是500米的正方形麦地，它的面积是多少公顷．
<gadget id="calculator">1 * 10_000</gadget>
<output>10_000</output>

<gadget id="calculator">500 / 10_000</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">500 * (1/20)</gadget>
<output>25</output>

<result>25</result>