The model height of a building is 7 cm. The ratio of the model height to the actual height is 1:400. What is the actual height of the building in meters?
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．
<gadget id="calculator">7 * 400</gadget>
<output>2_800</output>

<gadget id="calculator">2_800 / 100</gadget>
<output>28</output>

<result>28</result>