A swimming pool is 50m long and 40m wide, what is the area of the swimming pool?
一个游泳池长50m、宽40m，这个游泳池占地多少公顷．
<gadget id="calculator">50 * 40</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 / 10_000</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>