scale of 1:20000 is measured on a map to be 5 cm away from the Shanghai World Expo venue, so how many meters away are you from the World Expo venue?
一张比例尺是1：20000地图上测得距离上海世博会场馆5厘米，那么你还距离世博会场馆多少米．
<gadget id="calculator">1 / 20_000</gadget>
<output>1/20_000 = around 0.00005</output>

<gadget id="calculator">5 / (1/20_000)</gadget>
<output>100_000</output>

<gadget id="calculator">100_000 / 100</gadget>
<output>1_000</output>

<result>1_000</result>