A rectangular swimming pool is 300 meters long and 250 meters wide, how many hectares does it cover?
一个长方形游泳池长300米，宽250米，占地多少公顷？
<gadget id="calculator">1 * 10_000</gadget>
<output>10_000</output>

<gadget id="calculator">250 / 10_000</gadget>
<output>1/40 = around 0.025</output>

<gadget id="calculator">300 * (1/40)</gadget>
<output>15/2 = around 7.5</output>

<result>15/2 = around 7.5</result>