A building is 90 meters high and drawn on a map with a scale of 1:2000, how many centimeters should it draw?
某大楼高90米，画在比例尺为1：2000的地图上，应画多少厘米．
<gadget id="calculator">90 * 100</gadget>
<output>9_000</output>

<gadget id="calculator">1 / 2_000</gadget>
<output>1/2_000 = around 0.0005</output>

<gadget id="calculator">9_000 * (1/2_000)</gadget>
<output>9/2 = around 4.5</output>

<result>9/2 = around 4.5</result>