The model height of a building is 7 cm, and the ratio of the model height to the actual height is 1:400. How many meters is the actual height of the building? (Solve with ratio)
一幢楼的模型高度是7厘米，模型高度与实际高度的比是1：400，楼房的实际高度是多少米？(用比例解)
<gadget id="calculator">400 * 0.07</gadget>
<output>28</output>

<result>28</result>