In the mathematics activity class, Teacher Wang took the students to the campus playground to measure the height of the flagpole under the national flag. Their method is: first take a 3-meter-long bamboo pole, erect it next to the flagpole, and measure the shadow length of the bamboo pole in the sun to be 2 meters, and at the same time, another part of the students measured the shadow length of the flagpole to be 10 meters. Please calculate the height of the flagpole based on the above information. (Solve with ratio)
数学活动课上，王老师带着同学们到校园操场国旗下，测量旗杆的高．他们的办法是：先拿一根3米长的竹竿，在旗杆旁竖起来，量得竹竿在阳光下的影长是2米，同时另一部分同学量得旗杆的影长是10米．请你根据以上信息，算出旗杆的高度．(用比例解)
<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

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

<result>15</result>