The road from Yuechi to Guang'an is 18 kilometers long. The distance measured on a map of Guang'an City is 2 centimeters. The road from Guang'an to Linshui is 27 kilometers long. How many centimeters should it be on this map?
岳池到广安的公路长18千米，在一张广安市地图上量得这段距离是2厘米，广安到邻水的公路长27千米，在这幅地图上应是多少厘米．
<gadget id="calculator">18 * 100_000</gadget>
<output>1_800_000</output>

<gadget id="calculator">2 / 1_800_000</gadget>
<output>1/900_000 = around 0.000001</output>

<gadget id="calculator">27 * 100_000 * (1/900_000)</gadget>
<output>3</output>

<result>3</result>