The survey team measured the height of a water tower and found that the shadow length of the water tower was 20 meters. At the same time, the shadow length of a 2-meter-long bamboo pole was measured to be 1.6 meters. How high is this water tower? (column ratio calculation)
勘测队测量一座水塔的高度，量得水塔的影长20米，同时在附近量得一根2米长的竹竿的影长是1.6米，这座水塔高多少米？(列比例式计算)
<gadget id="calculator">2 / 1.6</gadget>
<output>1.25</output>

<gadget id="calculator">1.25 * 20</gadget>
<output>25</output>

<result>25</result>