In a mathematics class, a group of students measured the shadow length of a 3-meter-long bamboo pole in the sun to be 2 meters long, and another group of students measured the shadow length of the national flag pole to be 10 meters long. How long is the national flag pole? (Solve with ratio)
数学课上一组同学量得一根3米长的竹竿在阳光下的影长2米，同时另一组同学量得国旗杆的影长10米，国旗杆实际有多长？(用比例解)
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">10 / (2/3)</gadget>
<output>15</output>

<result>15</result>