It is planned to build a 40-meter-long teaching building. If it is drawn on the map at a scale of 1:800, how many centimeters should the length be drawn?
计划建一幢40米长的教学楼，如果按1：800的比例画在图上，长度要画多少厘米？
<gadget id="calculator">40 * 100</gadget>
<output>4_000</output>

<gadget id="calculator">1 / 800</gadget>
<output>1/800 = around 0.00125</output>

<gadget id="calculator">4_000 * (1/800)</gadget>
<output>5</output>

<result>5</result>