The ratio of the height of a cylindrical building to the height of the model is 20:1, and the height of the model of the building is 3m. What is the height of the building? (column ratio solution)
一座圆柱形楼房的高度与模型高度的比是20：1，楼房的模型高度是3m，这座楼房的高是多少？(列比例解答)
<gadget id="calculator">3 * 20</gadget>
<output>60</output>

<result>60</result>