Ding Ding wanted to know how high the flagpole of the school was. At a certain moment, he measured the shadow length of the flagpole as 20 meters, and at the same time measured the shadow length of the nearby 3-meter-long pole as 2 meters. How high is the flagpole of the school?
丁丁想知道学校旗杆有多高，在某一时刻，他量得旗杆的影长为20米，同时量得附近3米长的杆子影长2米，学校的旗杆高多少米？
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) * 20</gadget>
<output>30</output>

<result>30</result>