rectangular field with a length of 27.5 meters and a width of 18.4 meters covers an area of how many hectares.
一块长方形的田，长27.5米，宽18.4米，占地多少公顷．
<gadget id="calculator">27.5 * 18.4</gadget>
<output>506</output>

<gadget id="calculator">506 / 10_000</gadget>
<output>253/5_000 = around 0.0506</output>

<result>253/5_000 = around 0.0506</result>