The height of the China Pavilion at the Shanghai World Expo is 63 meters. If it is drawn on the drawing at a scale of 1:3000, what is its height in centimeters on the drawing?
上海世博会中国馆的高度是63米，如果按照1：3000的比例尺画在图纸上，它在图上高度是多少厘米．
<gadget id="calculator">63 * 100</gadget>
<output>6_300</output>

<gadget id="calculator">1 / 3_000</gadget>
<output>1/3_000 = around 0.000333</output>

<gadget id="calculator">6_300 * (1/3_000)</gadget>
<output>21/10 = around 2.1</output>

<result>21/10 = around 2.1</result>