The length of a rectangular square is 500 meters. If it is drawn on a drawing with a scale of 1:20000, how many centimeters should it be drawn?
一个长方形广场的长是500米，把它画在比例尺是1：20000的图纸上，长应画多少厘米？
<gadget id="calculator">500 * 100</gadget>
<output>50_000</output>

<gadget id="calculator">1 / 20_000</gadget>
<output>1/20_000 = around 0.00005</output>

<gadget id="calculator">50_000 * (1/20_000)</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>