In a certain area, the temperature on a high mountain in summer decreases by an average of 0.8°C for every 100 meters rise from the foot of the mountain. It is known that the temperature at the foot of the mountain is 24°C, and the temperature at the top of the mountain is 4°C. Find the height of the mountain.
在某地区，夏季高山上的温度从山脚起每升高100米平均降低0.8℃，已知山脚的温度是24℃，山顶的温度是4℃，试求这座山的高度．
<gadget id="calculator">24 - 4</gadget>
<output>20</output>

<gadget id="calculator">20 / 0.8</gadget>
<output>25</output>

<gadget id="calculator">25 * 100</gadget>
<output>2_500</output>

<result>2_500</result>