Xiaogang measured the ratio of his height to the length of his shadow in front of the teaching building, which was 5:4. At this time, the shadow of the teaching building was 12 meters long. How many meters is the height of the teaching building?
小刚在教学楼前测得自己的身高与影子的长度比为5：4，这时教学楼的影子长12米，教学楼的高度是多少米？
<gadget id="calculator">5 / 4</gadget>
<output>5/4 = around 1.25</output>

<gadget id="calculator">12 * (5/4)</gadget>
<output>15</output>

<result>15</result>