On a certain day, the temperature at the foot of a certain mountain is 3°C, and the temperature at the top of the mountain is -4°C. It is known that the temperature of the mountain will drop by 1°C for every 125 meters rise in the mountain. How many meters is this mountain?
某日某山山脚处气温为3℃，山顶气温为-4℃，已知该山区每升高125米，气温就降低1℃．问这座山有多少米．
<gadget id="calculator">3 - (-4)</gadget>
<output>7</output>

<gadget id="calculator">7 * 125</gadget>
<output>875</output>

<result>875</result>