There are 50 rectangular salt pans of the same size in Binhai Salt Field, each of which is 100 meters long and 60 meters wide. How many hectares do these salt pans cover in total?
滨海盐场有50块同样大的长方形盐田，每块盐田长100米，宽60米．这些盐田一共占地多少公顷？
<gadget id="calculator">60 / 10_000</gadget>
<output>3/500 = around 0.006</output>

<gadget id="calculator">100 * (3/500) * 50</gadget>
<output>30</output>

<result>30</result>