There is a mobile phone model at the entrance of a mobile phone supermarket with a ratio of 20:1. It is known that the height of the mobile phone model is 180cm. What is the actual height of the mobile phone?
某手机超市门口放着一个按20：1的比例制作的手机模型，已知手机模型的高度是180cm，手机的实际高度是多少？
<gadget id="calculator">180 / 20</gadget>
<output>9</output>

<result>9</result>